I also made a decent amount of money from oct 2017 till jan 2018 doing airdrops almost everyday. When there was so much money flooding into the crypto market the airdrops sometimes soared in price. The highest airdrop I ever got from 1 airdrop was only 200$ though, which I sold right away of course.

Knowing people that have been doing airdrops since the bubble burst though it doesn't seem to even be worth it anymore. Most airdrops have billions of coins and they airdrop you like 20 coins lol... like whose going to pay gas to transfer out 20 tokens out of 50b available?