in the past, I usually collect the free coins from yobit, I don't know what I do but in that time, I collect types of coins and until now, the coins are still in my wallet. but now, I don't have much time to do again and I don't play with the coins anymore. you can do this to collect various of coins and the best is, all coins are free and you can do as much as you can. but you need to think about how much time do you spend to do that and I think if you can spend your time for another thing and you can earn more big, then it is not worth for you.