Have you taken a look at FOREX? They have a lot of high-volume markets, frequently shifting, could be risky but could ostensibly be very profitable - even more so, at large volumes of market share.

Candidly, I'm wary of seeing the Bitcoin exchange markets flooded with capital in any way that might lock out those of us who trade at small volumes - where, at least, our Black Wednesdays are scaled down too. I don't believe there are any brokers exclusively on the Bitcon markets, yet, other than so many wallet companies themselves.

A diversified portfolio, in a sense?