I know these aren't products on the shelf, but I have definitely seen off market quadplexes in North Miami with a cap rate of 6-7.5%+ turnkey. 3-5% is what SFH are renting for in this area, I have been looking at the inventory for a while.

I would simply have left a welcome kit for each renter that included some shelf paper, toilet paper, and a new milky white shower curtain, plus a small bag of Purina if they have a pet.

I'd be open to some consulting to see if I can help streamline what you're working with, however I know when we were at ~15 units, there was no way to justify the cost for something that wasn't lower-end, off-the-shelf software. 

In all truth, my laminates - even the cheapest off-the-shelf Lowe's stock ones - have held up just fine and were the best choice for my B units.

if that's the case new originations through a top shelf broker or into a fund is far more realistic for most. 

A $10,000,000 property is inherently more complicated, needs a multiple of different skills to operate, has financing infinitely more complex than the $100,000 property.

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

I’ve paid myself back every penny I’ve put into real estate, so all my cash flow from here on out is infinite. 

I'm guessing you've managed to do this a handful of times and think you've hit some infinite free money loop.But the reality is this is no way to build wealth.

Highest LTVs, longest amortization as possible, and as Greg notes, infinite Interest Only if that were possible.But having more debt comes with its own risks.