Good points. Also, Negative trust depreciates over time and if you get a certain number of positive feedbacks it can become 'neutralised' so there is still salvation for some accounts though negative feedback shouldn't be removed and they should still bare the marks of previous behaviour regardless of who now owns them.
May I ask what is the rate the negative trust is depreciating by? But by becoming neutralised you'll still have -ve records, which most signature campaigns don't accept. But either way the buyer didn't negotiate at all, it seems with the feedback leavers to get to some kind of solution, so he should take the responsibility of buying this account and not ask for the negative trust to be edited/removed.
All different I think. Depends on several factors including number of negatives and their values, when they were left, then on the opposite all those factors but with positives. You'll notice over time that some accounts are marked as scammers but that will go away after a while and they get an orange number in the middle value. Sometimes even a couple of trusted negatives wont show up if you've got enough green (see marco's account).
Regarding the point that the buyer has no chance to prove that they are not acquainted with the seller, I would argue that in this case they look like two different people from timezones at least 8 hours apart. There is also an alt of the seller that was recently reactivated and registered on the same day as nyktalgia.
It can be another guy, who the seller has employed to do this. There is really no proof either way.
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.