In order to know you're doing a good job, Leo needs to feel rewarded. Whether that's with a great salary, excellent benefits, a corner office or some extravagant toys you buy for yourself, you're going to do some spending.
Working on your self-esteem, so you can feel great about yourself without all those external rewards, helps to keep you financially healthy over time.
Sure, material things are wonderful. But they're not the true reflection of your value as a person. Instead, donating some money or time, saving for the future, or buying only what you love creates power.