He explained it in the article, though it was easy to miss. If you need a large amount of cash for something, and a lot of smaller figures coming in, you pay for everything with revolving debt and let your receivables stack up in a bank account. It's one way to save up money for a down payment on real estate, maybe the only way if your lifestyle is close to your income.
That's why Debt-to-Income ratio is a thing. If you're someone who's typically adverse to debt but willing to make an exception in the case of real estate, and you're living close to your means (while renting), then it can seem to make sense to get your necessary down payment (plus closing costs etc.) through revolving debt. As long as your DTI remains below the cutoff, lenders are happy to let you do it.
I guess only another consultant could understand this, but no matter how you slice it, $30K/week consulting rates will never translate into $1.5 million/year. You won't even get close, and you'll break your heart trying.
You can't bill the hours you spend finding clients or networking or redoing your website or waiting around through four months of utter doldrums before being overbooked and killing yourself to keep your promises.
Don't get me wrong, I love consulting and I've done a lot of it. But sometimes you just want solve problems and get predictable checks, even if your effective hourly rate works out lower.
When I pay my lawyer $300/hour for contract work, all I can think of is, "How does the poor guy make a living?" Because I've seen the grim reality of the math. My lawyer works damm hard for that nice office. At least patio11 had a weekly rate (or maybe a per diem), and not an hourly rate.