The interest rate is only one component. 

It's the most important component of investments.  

I notice that on wholesaling calculator on this BP, there are section for "estimated repair cost" and under that section, it has Exterior Repairs: Roof, Concrete, Gutters/Soffit/Fascia, Garage, Siding, Landscaping, Exterior Painting, Septic, Decks/Porches, FoundationInterior Repairs: Demo, Sheetrock, Plumbing, Carpentry, Electrical, Interior Painting, HVAC, Cabinets/Countertops, Framing, Flooring, InsulationGeneral Components: Permits, Termites, Mold, MiscellaneousWould this be good enough (complete) list in which I can represent this list with (columns of labor and material costs) to the general contractor and be assured that I would be able to get a good ballpark precise range of estimated repair value that would be valuable to the end buyer/flipper? 

I need this service to thrive as I can see it being a key component of my expansion strategy.

@David H.I agree with the others screening is the critical component.  

Are there typical contract components that would bind the buyer appropriately to cover the payment of the loan and give the seller some type of recourse if they didn't?

Marketing, including direct mail, is not an event; its a basic component of how you make the phone ring and put food on the table. 

I try to keep well maintained properties and am in the replace with high quality components rather than slap dab patches that need to be redone every few months. 

exciting time, Jared....I could go on and on, and the inspection will be key, too, but just first impressions: look at all the major systems and components and their useful life;that is key...

Sometimes you can go to the BOH and get approval to replace the failing components if it is something like just a bad D-Box or something.Are you just assuming it will fail?