I found this to be a fascinating and most helpful book. It was so motivating I'm already working on three new streams of income, and about to start a fourth. Forget net worth! Cash flow is much more important, particularly if you're retired. Only one slight criticism of the book. It's a bit dated, but those few parts make little difference to its overall value. If you're currently struggling with how you're going to survive after you retire, try Allen's approach. It will open your eyes.
How passive it really is: Excellent – Once your ads are running, you could literally just sit back and watch the money roll in.  Again, you are spending money to make money here, so there is risk involved.  However, once the ads are set, the income can be very passive.  Keep in mind, you may need to monitor and possibly modify ads if they aren’t performing well.
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I’m looking at accepting a professor job. It’ll be more than a 50% pay cut. But I’ll have the same life you describe – endless summers and an entire month every winter to ski. I’m thinking in the end, eventually, I might even end up wealthier in more ways than one. Happy people tend to be the most successful. I have no desire to diversify. Dividend stocks allude me. CDs seem like a good choice for older people, but I have time on my hands and real estate knowledge, so I’m sticking with what I know, despite the fact that most people will tell me it is foolish and I should diversify.
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.