Airdrop is a very effective and low cost marketing tool.
Because the participants will help promote in order to get more rewards.
The result is:
The organizer feels that the investor is insufficient, or his operation is wrong, or that his marketing has a problem, he will not pay any bounty.
if he there are pay some reward, maybe will because he gave up halfway, let those tokens is worthless. .
The participant thought that he got a free token. In fact, he spent his much times.
finally can got valuable tokens with a chance of less than 5% of airdrop.