All top clubs pay over the odds. Barcelona paid €30m for that Shakhtar defender who wasn't worth a quarter of that, Real Madrid constantly pay over the odds to land players they want (James, Bale) and so do Barcelona. You might have a case for Bayern being considerate with their spending but nearly all top clubs pay high fees to land their targets. If Otamendi costs €50m and there's no way to bring that value down by negotiating with Valencia then we should at least consider this and evaluate Otamendi's possible influence on our team, which could be huge, and assess whether he's worth that sort of outlay or not - not base our decision on 'we don't want to pay release clause' notion.