As fans we need to get our heads round the fact that the men that run City, the accountants , the lawyers, the bean counters… they arent City fans!! They are people at the top of their professions there to do a job. Not just for the now, but to enhance their future employment credentials.
Selling an academy player = pure profit
Buying a player = cost spread over term of contract.
They obviously want the club to be successful, because thats really important too, but getting there, they dont care what players thats with as long as its a good business model