hmmmm.
its a little more involved than that. I use a mac here and had instant accessibility from the OS without having to spend an$1,000 (hello freedom scientific!). In fact, any devices for the disabled (no matter the disability) can cost anywhere from 4 to 100 times what the standard consumer electronic equivalent can (like a $400.00 microwave that talks when the same unit that doesn't costs less than $80 at your local wal*mart). That $200.00 PDA can cost the blind person about $1,200 with the modifications made to a standard PDA (about $20.00 in parts and a few changes in the onboard software).
The above is primarily why the disabled are seeing benefits (even if unintended) from devices like the iPad and other display devices (at substantially lower costs). The above is also why most state governments go broke trying to help their disabled clients.
I happen to be blind. I paid just under $1,000 for my mac. what I would have spent on a comparable windows machine? $1,000 for the computer, $250 for the windows OS, $1,000 for the text to speech software (windoweyes or jaws). frankly, my mac is a better deal. now i I can find a braille display that won't cost me a years worth of my fixed income in one shot ($6,000)!.