Doesn't surprises me much. In many cases, the bounty rewards are delayed by months. The participants may get their tokens many months after the bounty program actually ends. And if the participant is short of funds, then he will not think twice before off-loading the entire bounty reward in some exchange.
Good comments. Do you believe that when tokens are given earlier before exchange it can help solve this? I was wondering and I think it is quite will be good if tokens are given earlier before the exchange. The trick in my mind is that bounty hunters are busy and they really don't have the time to follow project(not all but most of them). They are always busy hunting, and if that is done they might not know too quick if the tokens hit exchange.