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".
Any investment is a gamble itself. We always don't know if that investment will give returns or just diminishing until nothing is left specially, cryptocurrency. Unlike any other investment that you have tangible papers you own and have value, cryptocurrencies on the other hand missing those things making it a gamble everytime you invest into it.