Alot!
I did buy the odd gem here and there but mostly i got copies. It was just to easy & readily available.
Back in the very early 90's, everyone local to me bought the Amiga not just because it was an Awesome machine, but also as they could get the games for nothing, minus the price of the blank floppies and postage costs.
While it may have played a small part in the Amiga's downfall, easy access to pirated software help shift quite a percentage of Amiga's to.
Going back further though, my C64 , well i bought every single game, i really cant remember any pirate software there. I also buy 90+ % of my PC games to, which is only a few a year though.
Looking back, i wish i did buy more games, but i was young, broke and it was just easy.