It's not just a technical problem. You've got a couple guys in an incubator, moving in with a few thousand dollars funding to start a website, who suddenly have

It's not just a technical problem. You've got a couple guys in an incubator, moving in with a few thousand dollars funding to start a website, who suddenly have to figure out how to safely float X million dollars in currency exchange on a rapidly fluctuating market with a huge ask/bid gap. If they overextend themselves too far on the BTC pool they hold in front of a spike/crash, they have no capital to correct, they could go under overnight.