People who comm know that its tiring being comm.
First off, you get no action, you just get to see it all from above.
Second, you have to be quick. Are upgrades going? Sonic needs meds? Diablus ran off with the HMG again? Seige upgrading? ebnar-fade at 1:30?
Third, you have to actually order your little ants around, and quickly make the best decision.
Fourth and last, you have to notice when things are under attack, and predict when things are going to be in danger, and act accordingly.
You have all this happening all at once, its stressful, and its only fun to do it when you're winning. No one likes to comm a lost game, but its still fun for the marine to kill things with alamo weaponry.
Some comms endure this stress up to 5 times straight. There are only a handful of people that are able and willing to comm (the rest are more of the latter than of the former), and you know who they are.
So just once look at your team. Rad4christ commed the last 3 games? You know the game well enough, why not give it a shot, and give the guy a rest. Don't just run off hoping someone else will get in the chair and win it for you.