Gamers are an easy mark, I'm sad to say. Lots of them are easily influenced by flash and no substance.
Aside from things like needing to preorder concert or sports tix because of limited stadium seating, or putting down a deposit to buy a brand new house that has to be built, how many other products are there out there where people put down preorder money for something that doesn't even run out like digital games? How often do the disc copies even run out? But for gamers, it's preorder mania as if gaming will disappear tomorrow.
Also, with the internet all a gamer has to do is wait for day one reviews to see if a game is good. It's not like the old days where you had to flip through magazines and hope the game you want is reviewed that month before launch. On one hand you're itching for a new cartridge, but there's no reviews yet. What to do? Now, a game launches and at noon there's like 30 reviews up, plus Youtubers amped up to upload their videos after dinner.
Yet some reason gamers cant just chill out and wait 24 hours to buy a game after sifting through info.