I had sometimes offers for players with 58% quality (98% for the list). I guess because that time there weren't many 99% players.
It is one of the unanswered questions of TE.
How many possible managers/buyers exist ? (for my player)
How many of them can see my player ?
Maybe there are some small bags of 99% players and small bags of buyers which rotate every few days.
My "bag" of buyers was always poor (I mean same server and near levels).