When a business owner deals with negative comments by accusing those who have complained as being some sort of conspiracy by the competition, that doesn't say much for the business owner's professionalism, nor does saying you'll pay anyone who has a bad experience.
Know what a professional approach is?
"I'm quite distressed to read that some of the posters here have said they had a bad experience at my restaurant. Please, if you ever experience poor food or service at my establishment, let me know right away, so I have a opportunity to get to the bottom of what might have happened, as it's of utmost importance to me to provide a consistent high quality product and service."
Defensiveness, accusations, and denial in response to customer complaints will cause me not to patronize a business just as much as poor quality product, service, or workmanship will. Whereas a business owner being open and responsive to complaints will often encourage me to give that business a second chance.