[GabrielF00]

My experience is that WCAG compliance can actually be beneficial to the company. For instance, an employer of mine saw a very significant jump in sales (as measured by A/B testing) by increasing contrast of certain important elements on a page to meet WCAG standards. I'm not saying this is always the case - the percentage of customers using screen readers is very small - but in a lot of cases, thinking carefully about font, color, or contrast choices can help more than just the disabled.

[Edit] To take another example, 10% of men are colorblind. If you're using color to convey information, you may be making your website very difficult to use for 5% of your customers. If you're operating at any kind of scale, the gains in making your website easier to use for 5% of your customers are going to outweigh the costs of making a change by a wide margin.