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?
Probably you are exaggeration a little bit but in general I can agree with you that airdrops are nothing really useful so it is better to join some other opportunities that are presented here in abundance.