Anytime you buy a crypto-asset, it's someone else cashing out.

Consider where and how these assets are created, as it's more than likely a system designed to extract wealth from greater fools.

If the system does not let you produce the asset for the same amount of work that someone else put in (cryptocoins generate the bulk of the supply very early, and then cut off produciton to new users forcing low liquidity markets to exploit new users), why would you want to contribute to that cryptosystem?