Hey all - Checked in this afternoon at DCA curb-side. The agent at curb side check-in, after checking my two bags, said to me matter of factly: Sir, we accept tips.

I've checked in probably a dozen times at DCA in the last year and have never seen anyone tipping these guys.

Am I just an ... for not thinking of tipping them? I'm a newish frequent flyer, so I'll admit ignorance here.

Just wanted to get the reaction from others if this is normal/acceptable, etc.