Earning a bit money out from airdrops will depend on how their price will behave. Some airdrop tokens, even right from the start, doesn't established even with the lowest amount of USD value.
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In my post is written "You can earn some money by selling an Airdrop once you get it ! It can sometimes be only a few cents, but it can also be worth 10$, 30$ or sometimes more !" .
and I don't really see the difference between "how" to joined some airdrops and not "how to earn a bit money with airdrops" ?
My explanations are going until the sale of the airdrop on Etherdelta , so it's not just how to join ...