Yes, I agree with your point because I am a victim of it. I sold Velic coin after receiving the bounty payment, now the price has increased x2! I sold simplybrand token, then it gained 87 %! My friend sold QNT coin at 1.8$ then it becomes 4 USD! Therefore recent harmony already gained x9, so, bounty hunter should hodl the bounty reward at least 2 months! This is my personal opinion!
Yes, I think because now Bitcoin has experienced a very good increase, so that ICO Tokens or other altcoins are brave enough to increase their prices, so hunters must now hold on to their assets.