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.