I've done accessibility work for large sites/corps and yes, it can cost to retrofit. Getting to the point of basic accessibility for most users is not that hard

I've done accessibility work for large sites/corps and yes, it can cost to retrofit. Getting to the point of basic accessibility for most users is not that hard if you actually -think- about it during the design and development process! Even the basic steps of using alt text, and seeing if your pages are readable with no CSS, and with different browser font sizes takes care of a huge number of issues that people encounter every single day. There are many more users affected than you think, and it's insanity to blatantly alienate customers.