Making your website accessible means making it available to the largest number of people possible. It’s already a Herculean task to get people to your website to begin with, so we certainly don’t want to turn a % of people away due to accessibility issues. I find that many developers don’t really understand accessibility, or shuffle it off to the “it’d be nice” list on their tasks. With a little education and proper tooling, it doesn’t have to be that way.
In many countries, website accessibility is also mandated by the law. In the USA, for instance, there is the Americans with Disabilities Act (ADA), which the DOJ has made clear extends to the Internet.
Companies such as Target (see NFB V. Target) and Netflix (see NAD V. Netflix) have been the subject of lawsuits based on this; but it’s also just good business to allow as many people as possible access to your company’s product or service.
If you plan on working on a website for US Federal or State governments (which includes educational institutions), the Website Accessibility Under Title II of the ADA document outlines the accessibility mandates for websites. Even public companies