Germany is not set up to have people get rich from a salary. Everyone has a comfortable life, but it's very hard to get "rich." That's one of the reasons I left Germany
If you feel secure in being able to maintain an income where you can enjoy both the basic and leisurely aspects of life. That you won't be made bankrupt by illness, or by unfair illegal/legal proceedings. In these circumstances the drive to sit on top of 2.5M to feel relaxed about your financial situation will likely fade away.