I only give it out to players I believe deserve it. If a healer or tank clutches the boss and the whole party dies? Guess who is getting my com?

Otherwise, if I don't see anything spectacular or enough reason to bother, I'll leave the instance without giving a com. You don't get a com for doing your job. You should only be worrying about those if you do something worthwhile to get it.

Most players give me coms because I raise as RDM in instances and manafication push to healers when MP is getting low.

Tanks using shirk in instances when it's needed without asking? My com.

DPS using goad? Totally my com.

BRD actually using refresh and tp regen songs without being asked when you can tell they're paying attention to healers and dps/tanks in the party on where their mp is or tp is at? Totally my com.

But if you're just doing your job, then nah, lol.