The all inclusive resort that I am a member at does allow tipping but they discourage their staff from receiving tips. I usually tip the bartenders a dollar every few drinks. The service is top notch even if you don't tip. But I feel bad for not tipping at the bar, especially when you are drinking top shelf for free. As for lunch or dinner, it varies for which restaurant I go to, the service, and the food. Usually a few dollars just because I am always drinking. This reminds me, I need to book another week at the resort for this fall. I can't wait to go back.
I feel that the resort that I am a member strives for excellent service so people continue to buy into the memberships and go back to the resort year after year.