Personally I think the infrastructure surrounding cryptos has a better long term ROI than the coins themselves.  You are banking on liquidity with the coins which is fickle at best and no really good place to unload sell them once they've reached your investment target.  That amount of money invested in cryptocoins is going to move markets when you try to sell them. 

As said earlier develop a good solid exchange.  I also think that a crypto bank could possibly have some merit too.

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