There's a big difference between giving away 99.975% of your wealth, leaving your self with what 1 person can OPTIMISTICALLY make in a lifetime for retirement, and allowing people to scarp half of whatever is left after your life of destruction.

Not only does that mean Gate's grand children have a grandpa with unimaginable wealth and power, but half of that is still in the family and all of them and their children's children are all set for an absolute decadent life even if they all decide to never move another muscle ever again. All while the world continues to burn rapidly, waiting for the dragon to bleed.

This is the bare minimum, and they only do it to gain sympathy and trick us into believing they aren't evil.