Why wouldn't it be ethical? eBay does allow sale of accounts, with their aproval. If it was sold to someone unethical, they would lose the Top Rated Seller rating very, very fast. It wouldn't make sense for a scamster to buy it to attempt a scam. They would never recoup their investment.
I'll tell you why. When someone builds up a reputation, I don't expect them to be able to pass that on to some dodgy bastard.
If you display a 99.9% positive reputation then I expect you to have earned it through quality service, not to have bought it from someone else.
Like I said in my first post, how would you like to buy a $2000 item from someone with a 100% rep and then find out that the person had bought teh account for $500 the week before and has now vanished with your $2000?
The whole rating system is meant to protect the buyer and seller, so explain to me how selling a reputation to the highest bidder does that?
A good scammer could sell multiple products in a short period of time and clear off with the cash before the disputes allow money to be reversed or before trusting customers even register a dispute. Granted, your $2000 selling price should limit the appeal to the average con-man, but...