Why bother indeed.

I have no interest in buyer feedback, my own or anyone else's.

I have my blocks in place to stop serial non payers and as most of my items are BIN it would make no difference anyway.

For my auction items I have better use for my time than checking out the feedback of every bidder just to block any that appear to have justified negs, back in the day when buyers could get negs it was obvious that very many of them were just retaliatory negs left by carp sellers and I would be happy to sell to them anyway.