I am a miner and I don't sell coins to pay bills. I mine to accumulate desirable coins at considerably cheaper rates than they trade at. That's it. If I feel the coin will have more value in the future, I don't sell it until then. I don't know why their is this assumption that all miners are living "paycheck to paycheck" and have to sell every coin they mine just to eat the next day.
Yeah, i'm a miner too. I'm usually decide what to sell right now and what coins should be held and sold in the future when exchange rates will go higher. For sure there should be some signs that the coin is not a one-day crap coin :-)