Don’t know why you think their comment is laughable.
It’s up to you to do your homework pertaining to a seller. Like how long they’ve been selling, and their feedback. Audiogon can’t police and background check every seller. But we all can when interested in a sellers wares. If you get burned anyway after everything checked out, you’re still protected by PayPal or your credit card company. Then give Audiogon a heads up on that particular seller. If they find the seller to be dishonest, they will most likely get banned. Always take caution with new sellers. It doesn’t automatically mean they’re dishonest, though. Every single seller on here started out new.