Airdrops right now are practically worthless because you get a few tokens here and there.  Once the ICOs are listed they're probably worth between $1-$20, maybe a little more, but it might cost you a lot more to be able to be deposited onto an exchange i.e. etherdelta.  So I wouldn't waste too much time tracking the airdrops.  If you get it you get it if not it's fine its water under the bridge.