Let's run that again... you, as a businessman, saw that letting people take as many donuts as they wanted, to the level of clear and present abuse, was an ineffective use of your goodwill, so you quit giving away donuts.
Yet Disney, which is a much bigger business than you ever dreamed of being, isn't smart enough to come to the same conclusion about the Fixin's Bar (with or without mustard or ketchup meters in place)?
What would Disney think if they sold 1,000 burgers, but were dispensing enough mustard and ketchup to season 2,000 burgers?