I'd say most airdrops are not profitable, if generally not even worth the time. The coins you get are generally super low anyway so. Can just make some money by working and buy some cheap altcoins here and there instead.
Unfortunately my experience with airdrops are the same. In my case %95 of the airdrops that I have participated (which I've done a lot up till now) was not profitable so I lost my motivation for airdrops anymore.