Idk, I started playing quite recently and from 1-50 as SMN/SCH I got over 300 coms as well. But that's not because I'm a healer, I get these same coms as a THM and DRG as well. It has nothing to do with the healing role, it's more about the way you help your team above their expectations. As a healer everyone expects you for at least... heal. You're doing your job. You queued for that, you wanted that and that's it. As well as the dps and the tank.

And personally I think that compared to the WHM, the SCH doesn't bring the "I did all that" feeling because of Eos/Selene. A healer that can save a whole team in the blink of an eye smashing buttons like crazy when everyone's about to die and survive is THE guy. But when you do that as a WHM it seems more com worthy than doing the same thing with a pet to cover you up. I tend to always give coms to the healer, but if I see that anyone on the team surpassed my expectations, sorry healer, no coms for you. Latelly I've been giving lots and lots of coms to tanks and DPS also.

You get faster queues than anyone else, you're the "we need you" of every team... Isn't that a good reward already?