One of the reasons why people think accessibility is expensive is repeated external audits. If you are not ready to do anything with the audit results, don’t do the audit. Like food in a trash can, accessibility audit results deteriorate with age. As soon as the code deviates from what is tested, the accessibility results start to become invalid.
alt: Simpson’s meme. Homer holding a sandwich he picked out of the trash with Marge looking on angrily.