Well it is really not a bad thing. It is a free market, and if miners want to dump their coins on the cheap at 5 satoshi, well yeah, someone could buy them all up and get a gpu at 1/2 price, BUT then all the low sell orders will be gone and the next person would need to pay the "real" price of 18 satoshi to buy gpu coin. So in conclusion if a miner wants to dump his coins at below his electricity cost, yes, a buyer will get lucky, but that is how things work and 10 minutes ago CEO could only sell gpuc at 5 satoshi, now he can sell them at 18 satoshi, so did he really lose anything? NO, but he NEEDS to market this coin like crazy to get the price and volume higher, then the problem will go away.
There is a risk though.
What if someone saved up enough coins, buying low over a long period of time?
If they pump the price on bittrexx up they can clean out the store. Most of the 280x units were sold today so this might have been what happened. If this happens then there will be no units for the next people to by, or not enough to make up for the discount the one person received.
And it is clear the price will not stay up there, it has already dropped down to right above its average price lately.