At that point my current HELOC will be free to be used on the next property and I will rinse and repeat, so "yes" this is a financing variation of BRRR.

What you just described is a variation of what I refer to as a perfect system.  

You will start to see the actual variations in the rate. 

The bottles were now selling at auctions and one variation was going for $3000!

Agreed, the "Syndication", "Private Equity Real Estate" or "DST" model are all variations of the same theme: - Pay money to sponsor who is supposed to be an expert investor.- Give them complete control over your money in the context of the deal or fund. - Wait and hope that they deliver returns. 

There are variations in design, features, upgrades and so on. 

I think that you're correct: in this interest rate environment, small variations in costs like the ones you've mentioned can easily eat up your cashflow.

Your description reads like you are creating a dozen variations of you.

It is true that the colors are similar being variations of teal and orange, but so are a lot of companies.

In the Twin Cities Metro area you will experience a HUGE variation.