I report these ads constantly. There's a "button" at the bottom of each ad to report it. Do it when you see a fake ad. It usually takes a few hours to see it taken down but at least they're aware it's there and can see the zero feedback seller's other ads.
Buyer Beware
Audiogon has seen a number of fake accounts trying to rip off members. If you come across an item that seems very low in price and advertised by a brand new member the chances are it is a fake account trying to rip you off. My suggestion is to not attempt to buy from any of these accounts.
They have figured out how to get bogus tracking accounts from USPS, which look like an item was delivered to your house. Until you can prove that nothing was delivered, which can take time, you are out of your money. In some cases, the more that time passes the less likely you can prove this.
I’m not sure why Audiogon can not do a better job of filtering these scammers out but there are a number of ads up now that are most definitely scams.