Peterborough have got the right idea. Sell a player when he is in form. Get more dosh.
Best value is to be had when a previously good (rather than hyped-up over-rated) young player is going through a bad spell (rather than reverting to normal standard after exaggerations about his ability). .
The problem with buying from Peterborough is the fact that they got a lot of their recommendations from the Man Utd scouting system when Ferguson was there. These were players that Man Utd looked at but thought not good enough for premiership but good enough for the lower leagues so Alex ferguson tipped Darren Ferguson off about them and they duly sign a good lower league player.
What then happens is they do very well in League One and everyone ques up to pay Peterborough lots of money for them from the Championship or the Premiership. Then when signed for them they can't really make the step up and that was the reason why Man Utd never signed them in the first place.
So for that reason I hope that he is not interesting Brighton. Let the others throw good money away.