Money, power and influence has a way to getting what it wants. They key thing to understand is that when large piles of money are to be made sharks are going to stirr, but even more importantly that Manchester city's owners benifit few in England. A lot of money goes trough City and away from England, rather than it would make the rich and powerfull in England even more rich and powerfull. That makes it easy to generate dislike for City among the English football elite, for they are not into much of a piece of this pie. Sports federations are ever so often corrupt when there is lots of money involved and hardly any transparency or accountabillety, and the media in England is pretty much tied to various interrests and agenda's too. And as long as the English football fans are willing to fork out ever more hefty prices for tickets and whatnot and read into the media then various backhand tricks will still be able to yield millions.
I work in IT and have lost most naivity seeing just how much corperate espionage is going around. Having years of experience on the stock markets ive pretty much seen all sorts of strategic moves trough backhand mechanics and media moves to leverage prices. To think that bussiness by nature wants to work by fair rules is truly naive, indeed it's always in the interrest of private bussiness to maximize gain regardless of how it might affect others providing they can get away with it.
Afaik when Sheik Mansour bought this club he bought it for a 100 to 200 million and then he dropped in about the same amount to make it a better team. Nowadays the club is worth over a billion. Foreign investers around the world could get the idea that investing in English top footbal clubs can be highly lucrative yet there will be only so much or few even willing to sell especially if it's not at the "right price". Value can be brought down though, football clubs are not so sensitive to this as stocks but a string of poor performance's sure can mean quite a bit in monetary terms.
Intristicly i cannot fanthom that the price of buying up a ref would be so high in comparison to the huge sums that float around this league. The only thing that is of consideration then is what can be gotten away with, or, when shit hits the fan wether they can make a unimportant fish fry for it. The key then is the power structure of a likely easily corruptable football association, ref decissions along this nature can always be questionable but if you can get The Fa on youre side then there not much difficulty to foul play along this nature. Add in sports betting interrests that have grown a lot too and you can make some easy corruption pay up bigtime. Am i'm saying that this is 100% sure the case, perhaps not, but i wouldn't be surprized at all.