Again speaking from experience in the market I operate in only, Roofstock isn't working with ANY of the biggest players in the Property Management space only the smaller operations who have a bigger need for another company to funnel them clients as they don't have a robust enough business to keep their pipelines full organically.

Dollar General and Dollar Tree have been building ~1,000 stores each in the U.S. each year for over a decade, and I've read people on the forums who have pursued strategies for building and leasing specifically to these players at a high volume.How is this rate of new builds sustainable, and how can we determine the point of saturation, when the pipeline ends?

You can own Stocks with a top-tier brokerage, maybe JP Morgan or Vanguard, or even a newer player like M1 Finance.

As of late, some of the other big players have been trimming the fat.

Find those players, and after that "The rest in heavenly", or is there other things to be done before throwing the ball to the sky?

Wells Fargo is not an investor friendly bank, nor are any of the national players.  

You'll also want to get to know the players in your market; check out local meet ups and start to get to know people.

I have seen many a company come and go.. and there is no question that the top players are far stronger than they were in the past.

I've been extremely passionate about investing, so I can break out of the endless job cycle and start making difference and helping other players in this wonderful game and I would ABSOLUTELY appreciate any opinion and advice from the community.

You need reliable team players, not lawsuits.