Airdrops pays, but you're not entirely sure the one that would pay well, so it's very much okay if you engage in more of them to increase your chances of making profits
That's why you don't need to put all your hope in it, if you are participating in airdrops, do not take it as an occupation or a real job because it can not generate for you a sustainable source of income, you can participate in airdrops just as a side hustle. Like you already said above, to be able to participate in an airdrop that will pay you off a good amount of profit is based on luck, sometimes you will end up to participate in the one that will not pay you, leaving behind the one that was supposed to pay.
It would be wrong for someone to consider airdrops as a main job, because it is a side task when you have free time then you can work on the airdrop.
There have been dozens of airdrops that have appeared, is there anyone who can do it all? Of course not, they will also research which ones are good and which ones are bad according to their views, including myself, I am always careful in participating in airdrops.
Getting profit from airdrops is not clear, sometimes the project always delays distribution, sometimes it is not worth it after months of work, sometimes there is no value, so they must be prepared with all the risks that will be accepted later.