you can make purchases from LIQUI Or Bittrex . Why you're making from the forum .
He had created this thread before HMQ got added to bittrex, just look at the thread date.
Selling HMQ at this point is just dumb. It's like buying a pizza for 10,000 bitcoin.
Maybe he wanted to invest in other project, or he has additional amount, moreover, if he sold them for Ether, he is in profit now considering Ether price.
Yes, Ether price has been increased so he might be in profit, maybe he is looking for another new project where he can make more money from it. But already it is listed in the exchanges why he is selling them by opening public thread.