Agreed, if the economics were the dominant factor people would definitely follow the money. Now that we've gotten you to acknowledge that to be a big "if", let's see if maybe we can get you to recognize that there is more to the economics than the challenge of maximizing your cash at any given point.
What I find somewhat annoying is the "challenge" you put out there that as much as says "put your money where your mouth is or shut up". I think you're taking an extreme position to make a point, but your use of "the money is the scorecard" mantra makes me want to puke. I truly never envisioned you to be like that and I'm having trouble doing it even now - I think you're just trying to make a point. To each their own, but I normally strive to avoid those people in my life. If I thought you were being sincere I'd be striving to avoid you. And vice-versa, I'm sure.
The gauntlet you've thrown down is the challenge to sell now, lock in the profit and live with whatever happens next. However, you have apparently declined to consider that there are other alternatives for making a buck besides selling now. You're treating this upside of the cycle like it's the last one that will ever come around. That is a straw-man argument if I've ever heard of one.
Anyone who characterizes the trends in terms of both sides of the cycle (not just the one) knows that the cycle will invariably come around again at least a couple more times in the next 20 years. A person may not need or want the taxable income while they're still working, but they do need a place to live. During any slow period of our cyclical business a lower overhead has some definite economic benefits that go beyond the difference in the overhead itself. Those benefits include the ability to thrive on less and the ability to avoid high-risk assignments just because we need the cash flow. From an economic standpoint it's an extremely safe form of asset management, too. That type of stability and security has an economic value. If you look at it in the long run and in the context of our occupation, "mortgage at or less than rent" is a tough strategy for some of us to beat, both in terms of cash management and in terms of stress.
Your strategy apparently works for you - I think that's great. However, you and I are in different lines of work and we are living very different lives. Maybe if I lived your life I'd be doing what you're doing. What we all need to bear in mind is that there is more than one way to live well and more than one definition of exactly what living well is.