This Saudi rumour has been going on for years but nothing has ever come from it. For arguements sake we assume there is something in this, unless Utd were planning to go down the same road as City re FFP, which of course their supporter would be dead set against as they hold strong views on this sort of cheating, then there would be no 'Saudi money' anyway. The only financial benefit would be no more debt but that's only costing the club around £20m per year - about the same as Utd will lose from their Adidas deal if they don't make the CL this season.
But don’t the glazers siphon money out anyway?