> Somehow most web developers care a lot more about the ~3% of users that use IE 10 or lower than about the ~4% of users that are legally blind and can't use a graphical browser.

It's only correct to infer that web developers care less if the cost of supporting either is the same.

(Also many legally blind people use graphical browsers; legally blind is not the same as "unable to see anything").

I readily confess I don't know many legally blind users, but the handful I do know all use graphical browsers with screen readers.

Is that not typical?

(That said, if you're using webfonts for icons you should be using the unicode Private Use Area.)

Well there's also the fact that 100% of those 3% are definitely online loading website while the same can't be said for the 4% legally blind.

I tend to disregard the entire <7% (assuming overlap).