airdrops is one of the worst ways of distributing a coin. it basically is giving away free money to a bunch of lazy people with nothing better to do other than claiming these coins every day and dumping them on the market to get the real money out!
When startup holds its own airdrop it works like a sort of avertisment. People get free coins and they get interested in it, especially if it gets some value in $.
quite the contrary.
people who claim these coins are only interested in it because of the $$$ value and because they can get real $$$ out of it. they don't care at all about the project itself. 99% of them don't even know what the coin is or does.
you are giving them free money! who is going to ask what that free money is? they just are happy they earned something that day while sitting in their underwear

Any thoughts on how we can make people earn the coins, other than paying for them? Would it be better to distribute coins through a bounty program only, instead of an airdrop?