Does anyone have experience with GunsAmerica as a Seller

I have an item that I want to sell. Read through the GA stuff on selling, have no problem paying them the $20 WHEN (if) it does sell (which they say iis pretty much "Honor System") as they really have no way of verifying that it did/didn't sell through them) , did all the registration stuff, etc. Now I find out that in order for me to post an ad, I need to give them a credit card number. What's with that? ... other that me saying here I'll give someone a signed blank check!

So I would appreciate any feedback if anyone have experience with GunsAmerica as a Seller or otherwise.

Thanks