The best airdrop I participated in was Decred at the end of 2015, the airdrop consisted of 282 DCR for each participant, I sold them for $49 each coin. Decred's ATH is $250. The curious thing is that there are still many accounts that received the airdrop and their owners do not remember the unlock key, the importance of protecting our passwords and having patience is always present to remind us not to make mistakes.