and you should - while you may think that it'd only be a dollar or three, some unscrupulous sellers will gouge you by putting the original bid low and making it all back on the shipping - ask before you bid!
I've bought used off of Ebay. Got a Burton T6 that was barely used (you could still see wear the price sticker had been on the base ) - got a smoking deal. I've sold on there too. I guess I'd rather risk the occ***ional rip off than go thru life looking at everybody with suspicion.