Hey, cool, the 10K tools list comment flags now! It's time to cleanse the city, Davey!
Wait, only 5 flags still? Ouch. That doesn't go very far.
How 'bout... 300. Or at least 40. They burn off quick...
Flagging appropriately is a positive and constructive thing for the network. We've recently made a change that allows users with high rep (showing general site knowledge) or high flag-weight (showing previous history of helpful flagging) additional moderator (etc) flags.
Going forwards, this change will also apply to comment flags, so you should be well armed to clean up the town.
I'd recommend we gradually increase the allotted number of flags. We could even do it based on a user's "score" of the valid/invalid comment flags they've thrown in the past. There's definitely a different threshold for what's allowed in comments vs. what's allowed in answers and questions.