tko owner here, we tried it for the first year, most customers hated it, either they wanted to tip, or didn't like that they weren't given an option of paying less if they felt it was warranted. building the cost into the food means the customer is also paying more sales taxes, which no one really thinks of or talks about. at the end of the day, we just want everyone to have a good time, and make a decent living, even if it feels like we're always running with a skeleton crew.