Airdrop was quite rewarding to me also, I made close to $2000 from hydro, almost $500 from Enumivo self drop, and a few others that paid between $20 and $100, but these were after I have participated in over 500 Airdrops
These airdrop were in late 2017 and early 2018 , now it is difficult to find such airdrop to pay a lot , I think we should not expect a lot of money in airdrop at the moment