why is this headset so cheap?

Is it just a crappy headset? i just need one that works so i can use it with my PS3.

http://www.amazon.com/gp/offer-listing/B0007N33IQ/sr=8-5/qid=1239391944/ref=olp_tab_all?ie=UTF8&coliid=&me=&qid=1239391944&sr=8-5&seller=&colid=