generate through the airdrop is very possible. but for the time it needs to select a reasonably careful about majority airdrop since almost either a scam and it's not a good thing. in heavy and certainly not work in accordance with the fee is received whose value is not how big too. better to focus that has big results as bounty.
I agree, but if there is a large audience that will register for your referral link, then you can earn on airdrops and more than in the bounty.
The most important thing is if we follow the Airdrop, don't expect too much because there are so many rushes in the airdrop. the best way if you want to make a profit is to follow Airdrop as much as possible - so the greater the chance you get profit.