This is the key insight. No matter how much dopamine you shovel onto your lizard brain, it will just adapt to it and demand more. There is no maximum speed on the hedonic treadmill. Serving others is the polar opposite of that, you sacrifice the things that would provide you with an immediate reward and the reward you get has nothing to do with satisfying a want. The only way I can describe it is you are only aware of it when it's not there, when you're not doing the right thing by someone, it feels like an absence of something expected. Like putting your hand in your pocket and finding nothing where something should be.