Once an airdrop is over, you've got thousands of names, emails, etc.
How do you turn those airdrop claimers into investors?
Or do you only use airdrops to increase the total number of token users?
I think most users who are interested in airdrop don't have spare money for investment so we can cross out the "How do you turn those airdrop claimers into investors?" line. In my experience, I saw some airdrops are being used just to spread the coins, get support from airdrop people, get listed on an exchange and instant money from the dev team.