Well, when you put it like that ...
I suppose for me it's more hope than expectation. I have trouble letting it go that we spent £42m on a player who is a liability. I feel like these sorts of mistakes will to, some extent, devalue any success we have i.e. well done, you won the league, but it's a lot easier when you can afford to blow £42m on a defender who plays half of one season, or £30m on a striker who does the same.
I remember signing Kompany for £6m and Zaba for about £3m. Maybe that'd be £24m and £12m in today's market. Still less than one Mangala.
Our transfer approach seems to be less 'scouting by a rigorous team of experts' and more 'football manager with the cheat code'.