of course, it is worth for you because you can earn free airdrops which you could hold until the price is increased. but I remind you that not all airdrops can get a good price to sell and sometimes, you need to wait for a long time to see the price start to increase. but you are free to join into many airdrops programs as they need more people for participating in their programs. you can keep as much as tokens after you've already joined and the best is maybe one of your coins will get increase soon.