Making money, especially free, is always profitable, but you also need to know when to sell or hold the token you receive. Even if I don't know that this project will be successful, I just recommend making money, even if the small money you spend on this project can quickly increase your profit in three times.
Yeah, I joined a few airdrops but in return I got almost nothing. There are 2-3 coins that worth less than 100 USD total.
There are too many airdrops but only few of them pay, and only few of them become successful. Majority of airdrops are cheap scams. Better for you to join ico/ bounty's. Try looking at ArcBlock. They have sig campaigns for newbies.