Earlier quoted context omitted.
You are mixing together business owners and rentiers (property owners). Very different things. Property owners don't need to work 60-hour weeks unless they are the sole handyman for 100+ houses.
I'm not mixing anything together. The intellectual property, real property or personal property you are referring to is the product of all the risks and costs I'm talking about. And, the rent-seeking from that property is the reward. And, that rent-seeking is very much taxed, contrary to the author's contention, at multiple levels and in many ways.
Owning real estate means that your income is market rent - carrying cost - amortized capital expenses.
My coworker owns about a dozen 2-4 family properties and spends about 10 hours a week on them. Most tenants are section 8, which means he's paid on time by the government and gets above market rate for marginal property. He probably nets around $250k.