(transfer from old site)

Private sellers and buyers do not think alike.
One sells a Nikon D70. Another wants to buy a system camera.
A buyer is looking for a used designer lamp of brand x. This search can take years depending on preferences and requirements.
A seller is selling an antique chest. It can be labeled as furniture, antique, or storage. Then the possible buyer has to choose the same label.
No sell/buy site does this today in a good way.