Also, a lot of people don't KNOW any better.
I know a few people that type quickly, and even have remarked that they dislike how certain keyboards feel, or hate certain key spacings, or layouts. (I have one friend who types at somewhere between 80 and 100 WPM (based on me watching her type,) and types a LOT, and she hates laptop keyboards due to the spacing and layout, and can tell when keyboards are mushy... but she soldiers on with a Dell USB rubber dome keyboard.)
But, the different keyswitch technologies... most people go to buy a keyboard. They don't know to buy a buckling spring board, or an Alps switch board, or a board with Cherry (insert desired color here) switches, and everything sold in stores is rubber dome - MAYBE there'll be one scissor+rubber dome laptop-style keyboard. And, they all feel the same. Kinda mushy, not great.
I'll probably end up loaning her my main 1391401 (hey, it's not like I'm using it - the EnduraPro's taken its place at home, and I have an M13 at work) when her Dell USB keyboard craps out, though... I'm almost afraid I won't get it back.