People don't deserve comms outright for just being a healer, in fact many of the healers I encounter in DF are supremely lazy. But when you go all out, keep everyone topped off, DPS or at times solo heal a primal fight because your co-heal was dead for 90% of it and walk away with no comms, it stings a bit. There are times I've absolutely carried the entire squad and nothing, other times I've been showered with comms on runs where everything was smooth. Unless you play a role regularly and deal with both the good and bad runs then you may fail to appreciate the miracles people pull out of their hats.