Probably the best expense I ever spend on is private planes—not because I like it, I don't mind flying commercial, not really any difference for me, but it helps me optimize for time. That way, I can see my kids more.

I would look for opportunities in anything that they're good at ... When people go look for opportunities that make some money, when you're not passionate, you don't put in the time and energy required to actually make it successful.

What's a successful business? Good revenue growth and good revenue and profitability, right? All that really matters at the end of the day, whether you grow or not grow, is how profitable are you?

I don't like volunteering my time. My wife loves volunteering her time. I think it's very inefficient for me to volunteer my time. I should make the money versus volunteering my time, because the money for the hours spent, if we donated the money, would have a much bigger impact to the cause than if I actually spent my time.

I'm not rich; I've just done well enough and I don't spend as much, so I don't really need the money. Does that make sense? If you just don't spend money, you don't really need much cash.