So why haven't they been sold in the past?? Pretty simple question, surely you'd be selling a major asset every year. Like it or not every club buy to sell, apart from city, even Chelsea still sell people.
You're making out we are selling a star every year, when in reality we simply are not
Let's look at this hypothesis in detail. Football didn't start in 1992, but I guess that 23 years is long enough to evaluate the above statement.
4th February 1992: Martin Keown signs for Arsenal for £2m.
16th July 1993: Peter Beardsley signs for Newcastle for £1.4m
1st August 1994: Tony Cottee leaves for West Ham for £1.5m
29th January 1997: Andrei Kanchelskis leaves for Fiorentina for £8m
6th February 1998: Gary Speed leaves for Newcastle for £6m
24th November 1998: Duncan Ferguson leaves for Newcastle for £8m
29th June 1999: Olivier Dacourt leaves for Lens for £6.5m
18th July 2000: Nick Barmby leaves for Liverpool for £6m
14th June 2001: Francis Jeffers leaves for Arsenal for £8m
31st August 2004: Wayne Rooney leaves for Manchester United for £26-32m
14th January 2005: Thomas Gravesen leaves for Real Madrid for £2.45m
6th May 2008: Andrew Johnson leaves for Fulham for £10.5m
25th August 2009: Joleon Lescott leaves for Manchester City for £24m
18th January 2011: Steven Pienaar leaves for Tottenham for £2m
31st August 2011: Mikel Arteta leaves for Arsenal for £10m
12th August 2012: Jack Rodwell leaves for Manchester City for £12m
2nd September 2013: Marouane Fellaini leaves for Manchester United for £27.5m