Because US is a shithole, muricans just go and use coinbase, you are ruining it for others, because of your shitty government mtgox has delays, just fuck off will ya, mtgox is for japanese and europeans get your stupid dollars from somewhere else
I just switched to Coinbase. Solves all my current needs, and I don't have to send a high quality identity theft kit some sketchy Bitcoin start-up run by teens in Central Europe in order to use it. Had money in the bank less than three days after initially trying to sign up. Got a fair price (not the Bitstamp price which is depressed by the desperate) and in volumes that localbitcoins cannot deal with.
If it would have been more clear that you can do something besides just buy BTC there, and that they (very logically) rely on the banks which one hooks an account to to perform identity and reporting functions, I would have signed up long ago.