I think most of the posts are missing what the entire article was actually about.
it was simply stating the obvious, cap ex is a fixed minimum amount and wont work as a percentage of rent when applied to your typical $600 or $700/mo SFR.
If you properly figure out cap ex, as in his simple demonstration (which im betting most of us havent done), even if you lower it down, cap ex is still $150/month on top of everything else on an SFR. Therefore it is physically impossible for a $600 or $700 SFR property to cashflow over the long term in most cases after you account for taxes, vacancy, maint. etc. it may cashflow well for 1 yr, 5 yrs, 10 yrs, maybe even 20. But if kept, then you are losing money.
If you are ok with buying yourself a job to help lower cap ex then thats a different story as he mentioned. I am personally ok with buying a few properties and looking at them "as a job". my reason? Because only I can fire myself from that job! I work in construction, job stability comes and goes. My initial intent with rentals WAS/IS to buy myself a job that I control.
Eventually I and likely others here plan to grow out of it. But for the immediate future for me atleast, I need a job only I can fire myself from.