Counter Service CMs are not allowed to accept tips. The protocol is to turn it down a couple of times, however, if the guest insists then you may accept BUT must turn it in to management. They claim they will either donate it to charity or put it in a pizza party fund, but I didn't believe that story so I never accepted tips. I was always flattered by the offer, though. Honestly, all you need to do is praise the CMs. They get a lot of complaints all day from guests, and never any compliments. It can really lift their spirits.