THE WORST SELLERS FOR ANSWERING QUESTIONS, Audiogon, Audiomart, E-bay.....Others

I spend many hours trying to get people selling things to either Sell or Answer Questions about there items, I call them "Face Book Sellers"     They would rather do anything but sell, pack and shlp something  The web site that seems to be the worst is Audiomart , and they beat every body else by hundreds........I have three deals going on right now, I send my Pay-Pal address for billing and they do nothing, send them a e-mail and they do nothing.....The other day I bought a 800.00 item, I have no tracking number. I have called and have no answers, I have e-mailed, with no answers.....The only thing I have is a charge of 877.00 and a phone number...........Nothing else.......Common manners are totally gone on the internet.....Right now I have over 10,000.00 spent and I can't get a answer from anyone......Some of the stuff will maybe show up, but most is lost on the inter net somewhere and will take another 6-7 emails .......So what do you find is the worst web-site for your purchases   ???