I've heard that a year ago guy's work taking big profit from airdrop companies but for now I think it seems like already done with it, because 90% of 8 drops that I am participating in our giving me less than $5 in general.
What you said is the true fact of current Airdrop situation. Last year Airdrop joining was easy and task involved is low and participants were also low so distribution of Airdrop was high and when they get listed you get good returns. But today Participating Airdrop needs lot of tasks and the return is like penny as lot of participants are their due to it the split of bounty is low and when the coin get listed the price is very low and selling airdrop coins is useless.