The two systems are fundamentally different.  

Secondly the stock market is based off of transactional volume and retirement accounts of even a large number of individuals is not going to have that great of an effect when understanding the current dynamics of stock market fundamentals.

No spring chicken, over the last couple of years I've sold homes and investment properties to more millennials than any other demographic and I attribute this to a fundamental strategy - positioning myself as a real estate professional knowledgeable of the local market and its conditions.

These faulty assumptions were often encouraged by their buyer's agents even though the  agents knew very well that the fundamentals did not support the comps they were seeing (and despite the fact that agents have a fiduciary duty towards their clients).  

I suspect that since you are a math guy, you will see the fundamentals of this sooner than later.

Fundamentally, in this story, I would earn your fee for you, so I can buy the assets I had to do all the work on to get to in the first place.  

The strategy is fundamentally different than paying off a traditional mortgage in that you use your HELOC as a place to store your money. 

Let's set the tone straight; most people don't get into the rental business because they like to manage problematic tenants, deal with leaky toilets or attend eviction hearings.Most people follow traditional investment strategies, that are taught to be passive, but that in reality are far from passive for the great majority of investors.At the very core, most people begin in therental business because they believe in the fundamentals of investing and desire to create some level of freedom and passive income to supplement their current income, and at the same time would like to have some sort of control over their investment.There is nothing wrong with this, and i certainly wouldn’t want to discourage anyone from buying rental houses, if that’s what you really want to do.

Learning the fundamentals is vital for long term success. 

to look at the fundamentals and metrics to buy or sell objectively.