I collect retro games because I love to play them
vs.
so if something were to happen I could always get a return on my investment.
And? It's not like I'm hunting down boxed copies of valuable yet shitty games just to flip them on Ebay. It's just nice to know that my collection has a significant monetary value in case of an emergency and I had to come up with some cash fast.
Video games aren't exactly an asset with high liquidity. While in an individual crisis, you may be able to convert the assets to cash, if the crisis is more wide spread, such as an economic downturn, you won't be able to convert them back into cash, without taking substantial losses.
In reality, the reason most people ask "Are video games a good investment?" is not because they want to build up a 401k built out of Magical Chases, which is what most people assume. It is more that they want to internally justify spending large sums of money on what boils down to toys.
Spending $100+ on a single video game that is over a decade old would be impossible to justify to your internal conscience if the game were to lose all value immediately. However, if you tell yourself "Hey, in 10 years, I can sell it for $200, and I'll have made money!" All of the sudden you've justified a reason to spend $100 on something that isn't the best decision for your personal financial stability. I would say the majority of the video game market, especially the VGA-graded market, falls under the greater fool theory of economics.
http://en.wikipedia.org/wiki/Greater_fool_theoryThe problem is, just with baseball cards and comic books, the market WILL dry up. Liquidity on anything other than the rarest of the rare will disappear. So, if you purchase a game for $100+, you are better off assuming you will NEVER get that money back. If you still feel justified with the purchase, then do it. But don't use a false assumption of a perpetually growing market to justify a purchase.