Cash, though, is to a business as oxygen is to an individual: never thought about when it is present, the only thing in mind when it is absent... When bills come due, only cash is legal tender. Don't leave home without it.
In earlier years, a lesser effort produced literally dozens of comparable opportunities. It is difficult to be objective about the causes for such diminution of one's own productivity. Three factors that seem apparent are: (1) a somewhat changed market environment; (2) our increased size; and (3) substantially more competition.
I have a house that I bought 55 years ago. It's warm in the winter; it's cool in the summer. It has everything I wanted, plus it has all kinds of good memories. Like my kids, I have good thoughts about that. I can't imagine living any better.