Yeah, almost all bounties and airdrops are worthless. I've seen wallets with like 50-100 airdropped coins, and only 2 of them were worth anything at all.

Out of every 50 airdrops you enter, expect only 1 to bring you some type of profit. Yes, the ratio's are that high for worthless airdrops to solid airdrops on Bitcointalk, very few actually understand what it takes.