The title of this thread is bit provocative, but the fact is that most people have a bad experience with airdrops. According to several airdrop hunters I spoke to, the majority ICOs don't pay out at all.
What's your experience with airdrops? Did you get scammed most of the times?
Participating in an airdrop is a game that requires luck. So we should not complain about it. As long as you filter these airdrop projects and look at their airdrops, you can actually make some judgments, which can increase your chances of getting airdrops. Everything can be compared, so you only need to spend a little more thought, you can make your judgment more and more accurate.