Well the highest earning that I earned from airdrop is about $200-$300 .
It was selfdrop if I'm not mistaken so far it was the only airdrop that I recieved that have a value.
The previous airdrops from the various coins that I hold have a little to no value currently, but I would still keep it because I don't need funds from it yet. Who knows, there might be hidden gems from these coins.