Who cares about accessibility? The short answer is you should. If you don't, you're not alone. A lot of people don't give a lot of thought to accessibility, but they should too. Why should you worry about accessibility? For this discussion, let's leave the legal implications out entirely, they're important too, but that's another discussion. Let's just consider your audience. Who is your audience? Do you like your audience? How would you feel if I told you I was going to take some of them away? Lack of accessibility might be doing just that.

• Low color contrast? You could be losing the one in twelve adults that are color blind.
• No alt text? you're losing anyone who is visually impaired or has images turned off for bandwidth reasons.
• No captioning of audio? You've now lost anyone who has difficulty hearing.
• Didn't bother making keyboard navigation possible? You've lost anyone with manual dexterity problems, as well as people using some types of accessibility software.

I could go on. Each type of accessibility you ignore, is a portion of your audience that you aren't reaching. You'd never consider ignoring clients you talk to in person, but you're doing just that to your potential online clients.  Why accessibility? Because if you make your site accessible, you reach all of your audience.