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?
If you want to earn more crypto than the one you are holding then you do not really have any other option but to begin your career as a trader, traders can multiply the amount of coins they are holding in a relative short amount of time but it is not easy, the majority of traders fail and lose their money so before you try to do it take your time and try to find a way to make money in the markets before you trade, if you can do that then you will accomplish your goal of getting more crypto without using fiat in the process.