... but think of all the poor chair salespeople who need those commissions from new chair sales so they can afford to get their kids the GI-Joe with the Kung-Fu grip! (OK, I've watched the movie Trading Places too many times in the past month)

Seriously, What I've found typically to be a bigger problem than the chair is the proper keyboard placement. Every place I've ever worked at either doesn't have keyboard trays so the keyboard is a bit too high sitting on the desk, or they have improperly placed keyboard trays that sit too low and you have to adjust the chair so it's sitting on the floor making the rest of me uncomfortable. Chairs haven't bothered me much.