I worked in a consulting company, which estimated accessability requirements to increase web development costs by 10%. It's easy to imagine some big successfull company paying it up like it's peanuts, but it's another hurdle for companies living on the edge. I was in another company that had done a lot of work on accessability. But in the end, they ran out of money and released their software extremely buggy, which contributed to their product failure and bankruptcy.

Non-bugginess is also accessability, but I don't see a law saying that you can't release unfinished software. So how would accessability be anything more than all the others unimplemented issues stuck in the backlog?