The main reason is that miners keep voting very high, so the block reward has been keeping very high, so the supply of coins is very high driving the price down, because there are always lots of miners having a big supply of coins that they dump immediatly. Not all miners do that, but probably a lot of them.
The minting phase will end very soon however, in around 10 days, and the supply of new coins should get much lower then. In about 3 months time the daily supply of coins will be at 1/100th of what it is now, the voting limit will drop from 1024 to 8 then. But you can expect a much lower voting when the limit phase starts in 10 days already. It's almost certain that a few people will start a "vote 1" campaign here as soon as the limit phase starts.