It seems to me that both "vintage" and "table radios" would require pictures to have much value, and I mean inside and out pics. So much of these categories are really all about depends greatly on appearance. With pics, these categories could be interesting, but I don't know how viable.
I like Jeff's idea of fixed price listings with the intent of eliminating "lowballers and haggling", but again what would stop someone from making "an offer", eg I have listed items as "firm" price but still almost ALWAYS get offers. To make this really work, A'Gon would almost have to have a "promise" or contract from the seller that the item can only be sold at the seller's specific price. And that would mean a highly sought after item can't sell for more either. Something like that could be attractive to me if implementable?
Re Clueless, I do like the idea of a more casual, informal chatroom section, which is what Audiogon used to be like-- sort of, but A'Gon found that "unpalatable". Were you around during those hot and heated days Clueless? While some casual banter "around the topic of audio?" appeals to me, I don't know how it could be structured to keep away from the insulting, profane, threats of violence, questioning of members ancestry, parentage etc.
Hopeful but skeptical? Craig