I don't think 95% fail, I think a vast majority of that don't try.  

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

This is a fundamental component of the BRRRR strategy that I have yet to understand.Or, does it not make sense for the friend to invest in this deal if they're primarily looking to flip? 

It wasn’t a massive deal—our expected assignment fee was $10,000—but when you’re growing a business, every opportunity matters.Everything seemed to be moving smoothly until the title search revealed a major roadblock: the mortgage discharge couldn’t be cleared because the person who needed to sign off was deceased.

You will be accessing a majority of that equity without having to pay transaction costs.

@Polat Caglayan The majority of investors who become involved in the section 8 program do so because they purchase lousy real estate and leasing the units to section 8 tenants is the best option on the table.

With the exception of some small markets in the Southeast, places like Cleveland are the only major metro areas where a regular investor can find cash-flowing assets with a mix of appreciation. 

But i was able to achieve the elusive infinite return on a majority of my RE and all of my investment RE that I purchased prior to 2020.Infinite return has the benefit that the finances are not the hindrance to scale.  

I have visited Greenville and I have witnessed major growth.

The vast majority of those people are exaggerating their successes.