United have spend a nearly identical amount in the last ten years. City chose to spend it on replacements for (expensive) mistakes, United chose to spend it on record breaking sums for Pogba, Lukaku, Maguire and on astronomical wages for Sanchez, De Gea and others.
Are you seriously suggesting AC Milan, Barcelona and the likes are in trouble because of the "oil clubs"? That is just ridiculous.
Milan were in downfall before City and PSG were even taken over. The reason? Their billionaire owner stopped investing. Talk about irony.
Tell me exactly how Leicester have fairly generated their income?
And that shouldn't be a fair battle, by the way, since United can easily outspend all the clubs you mention. It's only because they are run so poorly that it would be competitive. Before Abramovich, the PL was pretty damn predictable, and it was on its way to becoming exactly like the Bundesliga now.
Lastly, I do have a problem with where the oil clubs money is coming from. I just think it's ludicrous to claim they've "ruined" football. That process has been going on for far longer and the idea that the likes of Real Madrid and Juve are somehow the good guys is just absurd.