Well the four leagues and the CL United have won since the Glazers took over where in a big part down to the fact that Fergie had spend big before they came in. The likes of Rio,Rooney,Ronaldo where all bought in before they arrived. Tevez was bought in on loan because they Glazers never wanted to pay up for him-lucky in the end to be fair.
Also United havent spend more than they have received in transfers fees since 2009.
Also Fergie isnt going to be here for ever and doing such an amazing job. When he goes I just can see us competing without a big transfer fund.
It's not the Glazers fault that a number of Fergie's most expensive signings during their ownership, Berbatov (£30m, Anderson (£20m), Hargreaves (£20m) for example, have represented dreadful value for money and have barely contributed to the success of the team.
But yeah Fergie always does an amazing job and the money wasted on Anderson and Hargreaves couldn't possibly be a rather significant reason for the current state of the club's options in the centre of midfield. He's spent over £40m gross on players on average every year since the Glazers bought the club and the club's wage bill has increased by more than any other club with the exception of City over the last seven years.
Clearly sufficient resources have been made available to him and that's been reflected in the success of the team.