Getting on Mintpal will definitely help with prices in the long term as it will significantly increase the volume of trading.  I for one avoid using other exchanges when I can and I'm sure I'm not alone on this.  For me a coin only really becomes legitimate if it is on Mintpal as it is really the only exchange which I trust.  For those complaining about the price - get on with voting on Mintpal as much as you can and if people are selling at really low prices go and buy yourself a bargain.   When the price dips it's an opportunity to buy.  If people keep buying up the low priced coins pretty soon the supply will run out and then the price will inevitably rise.