I'm a dealer and I can't imagine ever throwing back a tip (unless the player tipping me made some innapropriate comment while tipping me). I appreciate every tip I receive. If you tip me $2 I appreciate it. If you tip $100 I appreciate it. Either way I'm tapping it on the rack and saying thank you.

Although I would have tipped more than $2 on a $2,300 pot, if I ever had a dealer refuse my tip becuase he thought it wasn't enough you can be sure I would have gone and spoken to a floor person.