One of the biggest benefits of employing web accessibility practices where you can actually determine a direct return on investment is with Search Engine Optimization (SEO).
SEO is the way in which search engines such as Google are able to find, index, and serve your website as a result when someone searches for something related to you, your product, or your industry. There are many factors in achieving good SEO in order to be among the first group of results, and web accessibility is one of them.
Search engine algorithms crawl web pages more efficiently and accurately when web accessibility is in play. This can mean your website gets listed in search results before your competitors.