Airdrops are crap mostly, you should consider this when trying to earn something here. Take part in hundreds of airdrops, collect dozens of tokens, sell several of them and buy a toy lambo 
Indeed it brings no how. even relatively small nominal, it also if they could be sold. because sometimes it can airdrop only as a sweetener, and we get can never be sold. but there are some who paid for and have a good price, it depends how we choose the airdrop.