From my understanding, the dev asked bittrex for  the coin supply to be halved to increase the value of the coin. Now, if bittrex didn't half everyones coins quantity, the holders would all be 2 times richer than before the changeover. Who is going to be paying this 2X profit in BTC? It would be Bittrex out of their own pockets. If bittrex didn't half peoples coins quantity, what's stopping every other dev doing the same? Bittrex would be bankrupt the same day if it ever actually happened that way, so they half peoples coins quantity, and the value doubles.