... Lot of miners have bought their equipment using btc, so they want to earn btc not usd. Also, lot of miners don't sell everything they make, at this price, you have to be quite desperate to sell the coins.
The miners need to unionize!
Miners, unite! You have nothing to lose but your chains! You are the Bitcoin proletariat, your struggle is the class struggle! If more than 51% of you unionize, you won't have to plead, you could DEMAND more $ per BTC, or else fork the fat, greedy oppressor! The so-called "early adopters" will HAVE TO mortgage their fancy wives and houses to to protect their ill-gotten Bitcoin spoils. The price will skyrocket, everyone will eat peaches and cream! Fight the power!