I used to sell 20 cars a month when I was with Autotrader (60 cars advertised) The cost and arrogance of them got too much for me so I cancelled, at the time the rep said no one leaves AT for good (he came in a few months ago..... he had left and was touting for a finance company) I advertise everywhere else e-bay, motors, car gurus, local paper, facebook, and have a good web site provider, since leaving AT I have still sold an average of 20 a month but saved £1000,s on advertising and increased my margins as I am not competing to be on page 1, Facebook really does need working at and takes a long time before results come through, you need to build up your audience and ensure all your past customers are fully engaging with you, time consuming but inexpensive and in my opinion is a no brainer.