This may be a dumb question, but having never sold or even listed anything on their site, I thought I'd ask some of you guys who have sold stuff there...
The FCBO team is spot-on with all the posts so far...I'm just jumpin' on the pile with ONE add.
Sellers CAN'T leave negative feedback for buyers, but buyers CAN ding-up sellers with negative feedback. Kooky asymetrical set-up to me when they first did it.
I know why Ebay did it (must have been 6-7 years ago now)...sellers logically want MONEY before they ship of course, in return they gotta be accurate in description/depiction of what they have for sale, and their "customer service" level is critical.
Ebay will remove negative feedback a seller really didn't deserve but only in the most limited, clear-cut cases.
For example, I sold a guy something, he used it for 3 weeks, then wrote Paypal to say he didn't even receive it, Paypal reversed his payment I had long ago transfered to my bank account as SOON as the buyer complained, sending my Paypal account negative, THEN the buyer left me negative feedback on top of ALL that.
It ALL got turned around BUT after an ordeal (proof of shipping, digitally dated photos of what I was selling, etc.) that lasted two weeks..but geez. Always horror stories like the one I just told, but on the other hand MOST deals turn out fine for all involved.
Again, folks are givin' ya good advice here. Good luck if you decide to "jump in da' 'Bay" ;)