There are several ways to reinvest crypto to earn more crypto. Here are some examples:
Breeding: cryptokitties, fishbank, etc.
Resale: openbazaar, landhodler, etc.
Gambling: bitstars, mbit, betcoin and others.
Has anyone had experience with these sites? Are there other examples of reinvestment?
How can you define gambling as a way of investment? I think it is just a way of entertaining yourself and you will eventually lose your money because the house always wins. Maybe this will push you to lose more funds if you try to recover your initial "Investment".
Breeding is a game that I can think what is going to happen if everyone will stop playing and "investing" in it. Resale could be the only legit way. If I were to choose between these 3 I would go for the Resale option.