Bro, don't agree with your 2nd paragraph...depends on how "greedy". I posted a thread earlier to advise potential bidder to analyse the team of the Seller. Player may be a key player who was just rested or red carded. Another possible reason is the business sense. If I have just bought the player for 10T in auction, I will not sell him for 7T if I had hardly use him.
For Scouts, last season I bought a 6 star ST and 6 star MC. Both turn up performance ranging from 4 to 6 !! I was patient with them (no choice having spend 50T on each) and played them against weaker teams to gain confidence. True enough this season they are turning up 7 to 9 performance.