actually a LOT of people do, but naturally they want to keep it secret so they can sell you extra stuff without you knowing that their enthusiasm is because it increases their salary. chanel, gucci, neimans, bergdorfs, barneys,
coach and saks are all on commission, as are regular places like home depot, lowes, circuit city, and sears. i work at best buy and we make it a point to tell every customer we talk to that we are not on commission (we used to be, though, but they changed it to inspire customer loyalty).
commission is a dirty little secret...that's why they're telling you how fierce the matching wallet would be with that bag...