I think signature campaign has just ended. And the Devs are very busy right now for implement the masternodes. No doubt that the more popular altcom have, the less possible signature campaign will implement again.
Damn, i think you're right. So the only option now is to just buy the coins from exchange..
Well if you believe in a coin and its future you shouldnt really bother to buy it from an exchange... Also it is still possible to mine it if you got a good GPU.