He spend 500 mil and get 50 tf ur talking about 


That 500 million isn't his money in the first place and he gets a free 50 million for himself.
its was explained like a lot of times when the girl bonded reach 95 favor thingy with him he gets 10% of all the money he spent on girls for himself thats his own pocket money the 10% only if they reach the 95 favor