If anything the recent history has suggested that the more you spend the more value you get.
Hargreaves - £18M, good first season, then plagued by injuries.
Anderson - £20M, good first season, shaky next two, some signs of quality this season - still too infrequent, but promising.
Nani - £18M, one of the players of the season, most assists in the PL by far.
Da Silvas - £10M, awesome prospects.
Berbatov - £30M, struggled to find his role first two years, finally played as a no.9 and returns with 20 goals.
Tosic - £6M, decent player, never really given a chance.
Manucho - £1M, crap.
de Laet, £unsure, i'm unconvinced.
Owen - Free, some decent cameos, generally a waste of a squad place, arguably helped improve Rooney's striking instincts last season.
Valencia - £18M, excellent first season, sorely missed this year.
Obertan - £3M, on borrowed time.
Diouf, - £unsure, not looked United quality
Hernandez - circa £10M, but signs of a future world class striker.
Smalling - circa £10M, young player of the year?
Bebe - £8M, raw talent, a good two seasons away from being anywhere near good enough - most of this fee used to oil future deals through Mendes.
This kind of shows that you get what you pay for. The only true bargains that have come off are the Da Silvas, Smalling and Hernandez. Still that's a total cost of about £35M for four unestablished young players, which is not that cheap.
If Fergie wants to improve the first team, he's gonna have to stump up the kind of fee he got Valencia for.