BUYERS, What Issues have you had with Sellers and Listings that Prevent you from Buying?

Agree that charging 3% on Paypal transaction erodes trust. When I see that I also worry that they will nickel and dime the packing material, boxing, etc. 

A fair amount of sellers also won't provide a shipping cost until you commit to buy as they want to make sure that they pass on actual cost to consumer. However, this creates friction as the buyer wants to know what they are paying before they commit. 

2) Use Hi-Fi Shark or sold listings on ebay to determine market price and then go down from 5% to 10%,

What is the logic of going down 5-10% from sold listings? 

There are so many things besides price that turn off potential buyers or cause them to bid lower as a hedge. A very good seller with a very smart listing will get more money from the same listing than a seller who is putting out signals that erode trust. 

That's the problem. Sellers have been burned by the A-Gon shipping calculator so they sometimes want to visit the shipping store first before quoting shipping price.

Just another example of an inefficiency in this marketplace. Supply and demand Econ 101 assumes that markets are efficient, buyers and sellers behave rationally, and that the products are near commodities....as we all know, none of these conditions are true and that prevents transactions from happening and ultimately depresses prices.