Oh, I can tell you EXACTLY what would have happened if I bought stocks instead of games.
See, I have a tiny chunk of stock in US Bank. My grandpa bought it for me & my siblings when we were babies (he worked for them.) My brother and sister sold theirs as teens to pay off some financial issues, but I still have mine. Used to get checks once a quarter for $35. Then the housing market bottomed out. The next check I got was for $3.50. Even now, over 15 years later, It's only recovered up to $20ish a quarter.
So- I would have started off putting more money into my existing stock in US Bank, with the intent to diversify once the gains were high enough, only to lose 90% of my value in the space of a few weeks. I know my game collection has not gained in monetary value, but I sincerely doubt it's ever been down 90%. More importantly, the entertainment value has never decreased, which is why I keep the things around in the first place!