If you were to read all the comments in the thread you would easily conclude myself and other users of REI Reply did not show up here on Bigger Pockets to "market" REI Reply.

But I don’t see how it can easily be accomplished in QuickBooks. 

If they are professional, they can explain this quickly and easily.

Contractor license numbers are matters of public record and easily looked up on your state’s Contractors State License Board.

This would depend on the location, I know in Texas the RV parks are generating $300/space/month in income, you are easily seeing 30% ROI for RV parks.

The example I posted very easily cashflows.

Flips can be done pretty easily in 7 days if they are simple and as mentioned with planning or a templated plan 7 days is totally doable even for one that needs a ton of work.That being said 1 day seems unrealistic unless they exclude a massive amount of planning before the project which maybe they are.    

It's seamless, makes tracking revenue and expenses very easily, provides me with bank account options for all of my properties as well as virtual credit cards AND a hefty interest rate on savings.

Lastly, they don't get a hit on their taxes until they receive their money, which is a benefit to the seller that is easily over looked. 

I can now easily afford more properties, but am a bit stuck.