Have you ever been told you cannot put a price on peace, love, etc.? It’s a lie. Everything has a price, albeit not necessary a monetary one. Failing to understand this usually leads to a failure in securing one’s goals. This is why we need to talk about the price of victory.
As an accumulation of national interests, a treaty is a disbanding thing if Member States consider that their national interests are being harmed. Result: a disunion.