The issue with buffet tipping at WDW is 1. even if it is a buffet if the party is 6 or larger in 2008 then an automatice 18% will be added. 2.At WDW buffets are not like your local buffet joint where the wait staff gets your drink order and you rarely see them again. They help with photos , answer questions, strike up conversations with your kids, help find a character they may have missed before you leave, take care of refills, clear plates, set up any special occasion things like birthday cards and cupcakes, grab your final refill in a to go cup so you can enjoy it in the park. I have never had a WDW server at a buffet that didn't earn the 18-25% tip I have left.