Usability is not something that can be 'tacked onto' a website. Like sales,
usability is not an option - it is something that you can choose to ignore
at your own peril or you can address it to unlock hidden potential.
Most website usability is the equivalent of a door-to-door salesman
chasing you down the street, getsiculating wildly, insulting you, then leaving
without saying what he was trying to sell. Usability professionals are
angry people because no one seems to think that this is a problem.