There's a really simple reason - lack of awareness. The situation is rapidly improving but many game developers still simply haven't thought about gamers with disabilities, or suffer from the misconceptions that catering for them is expensive, difficult, and dilutes the proposition just to benefit a tiny percentage of players who aren't interested in gaming anyway. Every one of those preconceptions is obviously completely wrong, it's all simple stuff that's cheap to do if thought about early enough, benefits all players whether they're disabled or not, but particularly the 20%+ of gamers who have a disability, who are actually more likely to be gamers than people without impairments. As it's a case of awareness raising, you posting on this forum helps. Never be afraid to voice your issues, developers are generally a very nice bunch who will want to know if people are having problems with their game, and if it's something simple to fix they may even do it for you. Dead Space for example had remapping patched in after a popular request by one single disabled gamer. Luckily there are others who think the same, and are working on raising awareness, so things are getting better. Take a look at http://www.gameacces...yguidelines.com, it covers the things you're asking for, and many more.
