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?
maybe just like that, because now many airdrops don't pay. only a few pay. but all that doesn't hurt to try it, if you get a reward from the airdrop, just consider it an advantage for you.