I tend to give comms to whoever is the most fun to play with. Playing with good players is much more common than fun players. If you respond to me after the initial "Hello!", you're likely to get it! If no one does, the next option I use is how much I enjoy their glamour. I don't avoid comming someone based on principle or whatever. Only if they're a jerk!

I think there's a good portion of people that give comms based on enjoyment rather than skill. I usually get about the same amount when I play DPS.