While quoted often here. It is not actually a rule on this forum .
I adhere to it since it is a rule on another forum I participate on and it keeps it simple for me to do so. I also think it is the right thing to do in most cases, since no amount of ?'s are as good as seeing and handling the knife. However it does come at a cost. Shipping isn't free and delays in selling are uncertain. There are at times overly picky(to unreasonable) buyers or those that just want to view the knife then decide if it is right for them on my dime-which I have had a few. I try not to take this stuff too seriously and this is how I have chosen to do it, but can see how others might not choose to do so in certain circumstances.
So while I think it is a good policy I also think it can be easily abused.
No disagreement with any of the above. I certainly agree that the buyer should pay the return shipping.. At that point the seller is just out a little time.