Yep. It may be a legit sale in this case but people will quickly learn to exploit it. Not hard to use a buddy to fake a sale as opposed to using an alt account. Allowing this just sets a really bad precedent and smart scammers will be able to get their account neutralised ready to scam or use again very easily.

In my opinion: if you buy an account, you buy everything. This includes debts and trust ratings. These shouldn't be removed just because it's now someone else's property.