what can reasonably be expected of a seller?

I have very low expectations with the buying and selling service of Audiogon. I have, in the past, had some transactions. Only a few and all but one went bad. I think the agreement one makes with Audiogon really is one that means nothing.
1. Audiogon really places ALL the responsiblity on the buyer and seller. The site offers tips, guidelines and I think? a dispute process that does not help (see number 1) . Anyone please correct me if I am wrong. I also think the venders (small) manufacturers and dealers also are not held accountable for bad business deals. If you have a serious problem with a deal or product and you describe it in the forum, it is discouraged and the thread will probably be quarantined. Buying on Audiogon is like putting your hand in the cookie jar. You might come out with a great oatmeal raisen cookie or you might get bitten by a black mamba?  And if the deal looks really, really good. It probably is a bad one.

I would expect this as a seller.
1. Know the condition of the item you are selling. Describe that in detail to the seller. That includes pictures, functionality, known defects, history repair, etc. Don’t say I did not have time to test item, look at it or otherwise. If you have too much to sell, too much to do, you are just a money maker not concerned in any way about a buyer.
2. Be somewhat knowledgeable about the item. A CD player has a drawer, DAC, output connections (rca, optical, balanced, etc) laser and so on. If you cannot answer basic questions about item, you probably should not be selling it. Especially if it is a high-end product and you want substantial cash.
3. Be detailed about how you will pack and ship item. What carriers will you offer? How far will you ship? International? Will you offer to meet halfway to avoid shipping? How well will you package item and do you know how? Many turntables and tube amps will be damaged if the seller just throws item into a box of peanuts. Are you just wanting to ship item, regardless of safety and insure item so that when it shows up in a heap of wires your response will be, “don’t worry just collect insurance money”? No thanks!!
4. Do you offer any returns or refunds and what are the conditions upfront? Do you offer that item will be arrive as it was when shipped or you will offer buyer something if not? Will item be shipped in original box? Double boxed? Once I ordered a subwoofer and it arrived damaged. The seller asked to take detailed picures, sent me a return shipping label and stated he would turn in the claim. He stated he paid to have it professionally packed and he would take it up with them. He apologized to me! That is really above board.
5. Be available and communicative. Many, many deals go south because the seller does not think it is appropriate to be communicating with the buyer. If you are too busy to answer emails in a week, a phone call that goes direct to voicemail or just unanswered I don’t think you will make a good seller.
6. State what you think is the buyers responsibilities. They have a role to play in the transaction that is crucial. If you think the buyer should have 3 days to inspect, install, operate and test item before a return, state that upfront.
7.  Above all else, be honest and fair. I cannot, as a buyer, expect a perfect item, perfect shipping and perfect transaction every time. If something goes wrong in the deal be fair, be honest. Try to save the deal if possible by bending a little.