Miners almost always dump their coin / complain about price/dev work. That's just how most of the miners are.
I'm a miner myself and low scale investor. Will this coin ever reach dogecoin price again ? I'm really positive. Bought in while is not too late.
Check out other not so popular altcoins, is not something unusual that initial investors dump their whole stake for the sake of making a quick buck.

Patience. Up to 20 Satoshi, there's only 7.42BTC worth of coins are for sale on Cryptopia. As soon as there's some movement, more than half of that will be removed and moved higher. Can you see this happening or only me ?