The real selling spree started with Mackail-Smith I think which was in 2011, but MacAnthony has been chairman at the Posh for 12 years, so it could've been in place for longer.
True they've had a period of success but at League One and Two level, but is that really an accomplishment given the amount of income that has been generated from player sales and owner investment over the last decade? Peterborough year on year have one of the most competitive budgets in the league and yet they have had a number of failed promotion attempts and are now playing in their 6th consecutive season in League One. Why is this? In my eyes it boils down to two reasons. Abysmal manager appointments and high player turnover. The income he receives and, albeit generously, puts back into the club should place them in the automatic places at least once in the previous 5 seasons. Since their relegation they've finished: 6th, 9th, 13th, 11th and 9th. That's 6 consistent seasons in a row (including their relegation) where they've had disappointing seasons. Hence why IMO although his policy adds sustainability to the club on the financial front, at the same time it could actually be damaging it. Sometimes it's simply out of the clubs' control when a player wants to leave so it's wrong to suggest all of his star players have left due to his policy. But what he has done is set a precedent that the fans and players alike are now used to. Risky thing to do when you're trying to take a club up the leagues as IMO, it suggests the club lacks ambition - which players pick up on.
His social media antics border on the embarrassing and completely tarnish his reputation. He either lies about what the club are demanding for their own players, reveals confidential information about transfer dealings or claims that he's after every single player currently plying their trade in the EFL or lower.