I don't drive and also believe the owners of the site should do more to get the site seen not to mention add more payment options etc.
It is a great idea but IMO and it's hard to explain but the sellers pay a fee and expect those fee's to be used for upgrades on the site and advertising of some sort
Visual references like the car stickers which are great by the way will definitely be bringing a few extra visitors and as I've said before I only found this site years ago due to the tape they used to have.
I'm afraid sellers are already putting enough work into getting visitors here but are the efforts worth it? I think my sales here have grown a little, but I've had lots of non-payers which is probably due to lack of payment options, So lack of footfall and non-payers do make you put less effort in since most of us are here to make a living