Quoted from Bugsy:If you want something that will increase in value, check out the stock market.
This is wrong...if you are smart about what you buy -- you can easily beat the stock market with pinball investing.
Here is something I wrote a few years ago running actual numbers of my current collection to what the same amount in the stock market would have gained (or lost).
Pinball won easily:
http://gameroomblog.com/guides/how-i-beat-the-stock-market-by-playing-pinball