Long post incoming -- gotta set some shit straight.
Man, some people have the most woefully incorrect preconceived notions about the word "currency." Even more frustrating are the people who do not seem to grasp the differences between fiat currency and Bitcoin. Money is absolutely anything that can be used as a trading medium, assuming that the parties transacting believe in the value of the medium. This medium can be cash, pelts, crops, cigarettes, or even Bitcoin. Forget about Bitcoin speculation, or its inherent "worthlessness" (which I will dispute further down). If people use it as medium for purchasing goods and services, IT IS A CURRENCY.
Despite what the armchair economists may be claiming in this thread, PEOPLE TRANSACT IN BITCOIN. How do I know this? I am a business owner who receives a consistent stream of Bitcoin payments. Many stores in Kreuzberg, Berlin have adopted Bitcoin as a currency of transaction -- to great success (
http://www.theguardian.com/technology/video/2013/apr/26/bitcoin-currency-moves-offline-berlin-video). Silk Road (and its successor) have seen BILLIONS OF DOLLARS worth of transactions. Many popular VPNs and hosting companies have been transacting in Bitcoin for months (or even years). Do people use it as a medium for exchange? Yes? It's a currency, plain and simple.
I also don't understand the point of comparing fiat money disappearing from the economy to missing Bitcoins. The function of modern currency is conditional upon the function of the fractional reserve banking system, whose existence is predicated upon debt. Deflation (the phenomenon that occurs when the supply of money decreases) within the fractional reserve banking system will increase the real money value of debt, in effect decreasing production of goods, demand, and spending. While this is bad, bad, BAD for fractional reserve banking, it does NOT apply to Bitcoin. Deflation can be quite problematic for economic systems which rely on centralized authorities to verify the movement of money (or more accurately, debt) on behalf of the economy. BTC is not created by a centralized authority, much less a fractional reserve bank. It is a decentralized currency brought into existence by miners, whose only purpose is the objective verification of transactions through means of cryptography. In fact, deflation is a BUILT-IN FEATURE of Bitcoin, and the deflation caused by a few wallets going dark is NOTHING compared to the deflation we are experiencing due to the increasing demand of Bitcoin. In fractional reserve banking, deflation may be a sign of a slowing economy (or people's unwillingness to spend), but with Bitcoin, deflation ONLY occurs when the economy is GROWING.
Another ridiculous oft-repeated claim is that the instability of Bitcoin categorically prevents it from being accepted by vendors. Using a payment processing service like BitPay (which charges MUCH smaller transaction fees than credit card companies), vendors can accept payments in Bitcoin and have the exact dollar value transferred into their bank accounts same-day if they don't want to speculate on the value of BTC. The only obstacles to vendor adoption is ignorance and politics. While it is true that Bitcoin speculators (read: hoarders) may be less likely to transact in Bitcoin, there are still a lot of people who see the benefit of transacting in Bitcoin, and do so on a regular basis.
Oh, and if I'm still debunking ridiculous claims, let's talk about this whole idea of BTC being a pyramid scheme. The misguided notion that a pyramid scheme is defined as something that's beneficial to early adopters and painful for late comers is wrong. Although that may be a SINGLE feature of a pyramid scheme, one similarity does not make two things equal. To claim otherwise would be to commit the fallacy of a false analogy. A private company going IPO is not a pyramid scheme, even though it's incredibly fruitful for early investors and much riskier for late investors. Gold mining was not a pyramid scheme, despite being incredibly profitable for early adopters, yet very problematic for late comers.
A pyramid scheme is a planned conspiracy in which a conman (or conmen) convince unsuspecting idiots to invest into a fake and incredibly vague service/product, with promises of great riches. Recruited idiots are then sent out to recruit more idiots to invest into the same fake promise. These new idiots go out and recruit even more idiots. At the end of the day, the conmen run off with the investment of said idiots, never actually having provided any product or service. Bitcoin CANNOT be a pyramid scheme because it is a real commodity. It is trading medium that allows people to transact without fees or scrutiny from financial institutions. It allows people to send money anywhere in the world for free. It is an infinitely more secure way of transacting online than the traditional methods (like credit cards, Pay Pal, Western Union, T/T, etc). And finally, it is a sound investment into the future of online payment systems.
It's understandable if you're angry that early Bitcoin adopters are millionaires, poised to become even richer, when you're stuck pondering an investment you consider to be risky. I'm pretty angry that I didn't invest in Tesla when it went IPO. But I'm not going on about how the Tesla stock is some pyramid scheme.
Even IF we were to accept that ridiculous definition of a pyramid scheme, it still wouldn't apply to Bitcoin. The claim that late users of Bitcoin would somehow be hurt or swindled by early adopters is nonsensical. Even if Bitcoin is worth $10,000,000, and all the early investors are fat cats living off of a sound investment, Grandma Edith can still use it to send 0.1 BTC ($10,000) to her sister in Poland without any fees or financial scrutiny. Even IF all the fat cats bought out and crashed the price of BTC to $0.1, cousin Rick could still sell wood-carved Elvis heads online for 1000s of BTC without the transaction fees of credit card processors. How exactly are these later adopters left holding the bag?
Anyways, there's a fuckload more I wanted to say, but I'm tired as hell. I'll leave it at that for now.