Looks like you joined good airdrops because you said that sell a % of the tokens, for me, it's not worth, I've never participated in a good airdrop, all of then I got useless tokens that I can't even sell, it's really sad, Only 1 airdrop was good for me, the Keybase stellar XLM airdrop, all other I've just lost my time with it.
Stand out in the beginning and end with criticism, which is what I can say about airdrops until now, every day a lot of airdrops are created but the amount of airdrop that can be deserved is too low for market demand, as you say, a lot of tokens we can't sell and every time we look at our wallets, they are really obnoxious. We should probably just take part in the airdrops for which the token is listed, a few dollars with steady accumulation, it may not be too bad for newbie but for some people who already have a stable job, airdrops only prevent their footing from work