What other reason could there be?
This is called business. Tell me, once you have the amount of money that satisfies your needs, what will be your next desire? Rich people are people who have received everything from life and have great opportunities to fulfill their desires, but in addition to this, they become rich because they understand perfectly well that the money received from their business should always work. The word "always" here means an engine that constantly brings profit. Any capital should not lie as a dead weight. I do not see any competition or anything else here, but I see smart actions to continue and increase their capital.