I am not going to disclose the amount but i have been pretty lucky in the past. But i don't think that's a reason to chase them, as that seems to be job for a bots now, and probably no matter how you "mine" them, it's going to cost more in fees.
Past airdrops were much different and it happened to be so that people weren't expecting to make a lot of money on it. They participated because it was something cool and they wanted to do more things. Because a lot of money was made in the past this attracted all sorts of bad people who now organize to farm airdrops, and have ruined it for everyone. These days almost all airdrops suck hard.
I would go as far as i would separate them completely. As labeling both pre-announced giveaways as airdrops, and and actual surprise airdrops under same umbrella is misleading, as have very little to do with each other.
But it's the same thing with all trends. When one kind of think is making people rich, people try to copy the concept and hope they will fool people with it, by implying it's some kind of way to riches.