Maybe test it out before allocating large quantities of capital.

Unless I'm grossly misunderstanding this, wont you have to place a large number of offers onto houses to get a decent quantity that will stick?  

In such circumstances, quality of cash flow is every bit as important as the quantity, since quality cash flow will not stop as often (or perhaps not at all) in a down turn and if it ever does it is much easier to restart.

I know it's stupid but it works.But the real solution is the crass truth that QUANTITY HAS A QUALITY ALL ITS OWN.

If what we are seeing here is true, combining the millennials point with the quantity of SFRs and the supply/demand point, then it means the next boom will come when millennials will have kids, ( if they ever do... hahaha... they don't seem to be so excited about having kids).

I am on the threshold of needing to raise large quantities of money (large is relative, so I'm talking in the 500k-1.5M).

I would expect to charge a flat fee, with perhaps time or quantity restrictions.The idea is based on several assumptions: 1 - people looking for such a home may be far enough away that it is difficult for them to spend the time on-site to search. 2 - real estate agents are eager to sell their own inventory and may not pay a lot of attention to the buyer's wishes. 3 - buyers would be willing to hire someone to facilitate the search. 4 - buyers want help from someone who listens and acts in their best interest.I don't want to represent the buyers in any legal sense.

In order for actual big expansion, I needed to dip into absentees and hit a higher quantity, during which I still focused on Probate leads separately, and these were still by far better and higher conversions.

Large quantity owners and/or large complexes will see economies of scale though. 

I think your biggest problem is the unknown quantity of the quality of tenancy.