DOA- do we need to redefine the 'A'?

Goners,

There was a thread recently posted by a seller who was in a disagreement with his buyer about financial responsibility for fixing a malfunction that occured about six months after the sale. Most people agreed that asking a seller to help pay to fix a component that he had sold in perfect working order six months before was unreasonable, but that had the component arrived at the buyers doorstep dead, or had it broken within a short period of time, financial compensation or refund might have been in order.

Here's my question: should audiogon define a 'warranty' period that goes along with used sales? Even just 10 days or something like that? It really would stink to get a piece of gear, use it for a week, and have it die. But according to the policy that the seller is responsible only in cases of DOA, the buyer would have to front the whole bill for something like that. Having a specifically defined warranty period (which would, and should be quite short) might avoid a lot of potential conflict. Thoughts?