As R4N S S says you got to get them on ebay at the right time ive seen a few sets of the 16s go for around £150-£280 i payed £150 for mine off ebay but had to have them refurbished but there has been a few sets ive seen that have made around £300-£350. I dont think you'll make £500 on them but saying that you never know with ebay it all depends who wants them at the time for some reason they dont sell aswell as the 17s imo the 16s are the better ones to have as you dont have to worry about them catching the arches or rubbing on lock