i'd love to get into coins but it doesn't make sense to me. do people actually use them to buy stuff or is it more just trying to make profit?
Well there are two kinds of people in this game. The ones that see the true potential and want to see the internet evolve and be more secure, fair and just. Something that could genuinely replace fiat money all over the world and actually give power back to the people away from asset and fiat money hoarding super rich. That is certainly something that could be achieved with that technology, even though it is impossible to say what would be the catalyst or where it goes.
(Be aware that this is more theoretical and we can't forget the human factor which could mean that people heavily lobby against it, governments banning it and sheer greed completely exploiting it)
However the people with money are also already in this game and most of it all is owned by a few wealthy individuals. Like 90% of all bitcoin is in less than 3% of the big wallets (I think).
Then there is the ponzi scheme and finding future idiots pure speculation and gambling side of it. Nearly all crypto currencies you see are a big pump and dump where the early adopters luck out, grab a sweet 10x or 100x and then leave the mainstream with bagholding.
I would guess nearly everyone who is invested in crypto has only one goal and if they were completely honest about it when you ask them they would say : "I hope my coins skyrocket and I cash out in fiat currency ($,€, etc) and buy a house, car and enjoy a comfortable life without work".
There are ways to use these coins for actual purchases, but I haven't looked enough into it. I don't think there are actual infrastructures that could support global widespread use of instant transactions.
It is impossible to predict the future when we are facing "breakthrough technology". People in the 80s couldn't have predicted that an online bookstore becomes such a global powerhouse that the dude can fly to space and has a higher networth than entire countries GDP.
Eventually hindsight is always 20/20. If crypto goes nuts and actually has a breakthrough then people will be like "of course it was bound to happen that our system gets replaces with this", but if it crashes completely then people say "yup just as a I though, crypto was completely worthless and reminded me of the tulip mania".
It is a leap of faith or a gamble, but so are most things in life and the FOMO aspect of it and seeing people talking about it and making big money certainly doesn't make it easier for us.