Having grown up in Florida, I was paranoid about the wind and a potential fire and sure enough at 10AM one broke out in the vacant lot adjacent to our property. 

A few days before the sale the frame farm house was burnt to the ground and all that was left was the standing brick chimney and a lage pile of ashes. 

@Ilir Livadhi I think you are referring to property wholessalers telling you how much the rehab will be - and as you see, their numbers are often not based on reality.

Around this time I discovered Bigger Pockets and a bunch of real estate platforms online.

No one's perfect and honest mistakes happen and a PMC often needs guidance as to what level an owners wants to maintain their property.Wasn't trying to solicit your business,so I'll respond via DM about the rest of your questions:)

But it would be nice to have access to the software and a place to basically wholesale the ones you don't want for yourself.

As an investor and a commercial real estate broker I would not expect a buyer  to spend a dime on due diligence unless the buyer/seller come to an agreement on a purchase contract.

It includes HVAC filter and a few 'free' things (like one free lock out or something like that).

I do / done many rent to own (contract for deed) and a few seller finananced deals where I keep the note.Why not in parallel use a flat fee listing on MLS too?   

I think this is a calculation a lot of homeowners are making right now--especially if they have a low interest mortgage, equity, and their house will cashflow as a rental.The choice is a personal one of course, but I think your future self will thank you if you pull out some equity from your existing home with a HELOC for the downpayment on the next house and a cushion renting your current home, use a property manager as you have other things to do, and buy the next house and do the same thing again.