If they were unwilling to sign, I would take that as a sign that they were not a serious buyer, and thus someone I should not put much effort into serving.

Despite the efforts of our best data scientists, using the latest tools in predictive analytics (using predictive modeling, data mining, machine learning), we never got it to the point where I felt we should offer it as a product.Outside of that, the only thing that really works is to research every property that meets your requirements and show up for every sale.

I can tell you having been in sales for 20 years+, despite your skill and best effort the deals are a result of a numbers game.  

Most of my efforts in RE are as a hard money lender.

I can look further.Of course, until which time my current model can't move forward anymore, due to interest rates or 10 property limit or something else, it probably still returns at least as well if not better than the earned equity method, and also with much less effort.  

They're out to make money off of you with the least amount of effort. 

That produces a lot more cash flow if you're willing to put in some learning and effort.

Even though it is next door moving always takes considerable effort.

But...My suggestion is: if you want to put effort into rehabbing homes for flipping, you should put in a little extra effort and find those same homes for $50-70k (instead of $79k) YOURSELF!

(Well, it works better as a joke than as a genuine comment)...How about instead, you look seriously at what @Wilson Churchill wrote!?