I don't think it is about putting money in as much as it is about putting time in.
So to shift your question a little, how many people that have money put their time into something useful? I think this number is quite high. Whether it be building new ventures or doing volunteer / philanthropic work. Once you don't have to "make a living" you get to decide what is important to you and live accordingly.
Look at Elon Musk. If he didn't have all his PayPal money he wouldn't have been able to found Tesla or SpaceX