I'd need to BRRR and pull everything out plus some...meaning I'd have a great ROI because I'd have nothing invested...On the other hand, if a SFR yielded 1300/mo cashflow, I might be happy with as low as a 10% ROI because of the absolute dollar amount returned for my amount of effort.Where you fall on this spectrum also depends largely on how much capitol you have to work with and where you are in life with respect to your goals. 

Also, what type of properties usually dominate in this spectrum of real estate ?

I read these two blogs: http://www.mrmoneymustache.com/MMM Focus more on the savings and frugality spectrum (or reducing your expenses) http://www.financialsamurai.com/Financial Samurai deals more with ways to grow your wealth through means other than W-2 income ( or increasing your assets).

I would never use "walking away" as a strategy, but I only asked so I can have a full understanding of both sides of the spectrum, so to speak. 

I own a duplex in east Fort Lauderdale that I got off market that has done well on both ends of the spectrum.

Great markets like Dallas, jobs, pop moving in; solid value plays w conservative accounting, assumptions and leveraging experienced team that's been through full spectrum of the economic cycle.

There is a long spectrum of NNN properties from retail to industrial.

The source I was using to post headlines was much more random, or broad spectrum of news links, that sometimes are just economic news in general rather than real estate related.

There is a spectrum of risk and difficulty vs rewards as in any situation.

In fact, they approached me about the loan, not the other way around.My pool of friends and family probably consists of a spectrum of investors with different tolerances for rate, capital, term.