It's pretty simple. Do something to make me smile, and you will very likely get my comm. Of course, it also requires sticking around long enough after the duty. Far too many times the player I want to give my comm to bails before I get a chance to give it.

I also have a tendency to give pity comms. Sometimes I feel so bad for a player that's really trying but just can't stay on their feet. I know what that's like, and have been there.

I may also give them if I like your glamours, or if the player is new to the instance.