"Shorting" turns out to be a complicated construct that needs a lot of regulatory pieces in place. The exchanges are largely unregulated, and have a track reco

"Shorting" turns out to be a complicated construct that needs a lot of regulatory pieces in place. The exchanges are largely unregulated, and have a track record of messing people around when a price changes quickly. Bitfinex is big on offering complicated margin trades that nobody else does ... but you can't get actual money out at the moment.