I'm still wondering why developers will organize airdrops and distribute an amount of tokens which is far lesser than the minimum amount of the tokens that can be deposited on an exchange for trading. If you don't want the users to cash out the money, why do you let them waste their time?
Airdrops is a part of marketing idea in order to gain more supporters, in this case, the reason why it is lesser and its a small value is that, it will drive the emotion of the holder to buy more, when its listed on the exchange so that he could sell it, and when he see that the project is gaining more popularity, this is the time that he will buy more on the tokens and might be able to invite more users on the project, actually airdrops is much advantage compared to bounties, it has lots of advantages, but after all its a marketing technique and strategy.