I know there are quite a few property management companies and partnerships that hold large quantities of properties, and therefore, I assume, would have a corner on rental rates.  

Some of the areas that I invest in, cities give down payment assistance, credit towards college education to an owner occupant and that's a huge positive for me, because in the end the quality and quantity of owner occupants will determine the direction a neighborhood moves into.There are some neighborhoods in my area where the houses were selling for $80-$100k few years ago and now no one will even touch them for $5k.

Regarding the quantity of deals each portal has done that is of little consequence to me.  

Also  when driving for dollars is it a good idea to mail weekly or a large quantity at once ?

Going for quality over quantity myself.

On the other hand, there will be at least a short term upturn in the rental business as both the quantity and quality of tenants increases.Mike

It is great that you wife like the idea also as harmony on the team certainly helps when you hit the occasional speed bump.Send me an email and we can trade contact details.

There is a specific species of algea that produces a high quantity of oil than can be refined into biodiesel.

From there I could scrub the list removing all LLC, company names, foreclosure(properties with bank names). and all I have to pay for is stamps, envolopes, printing paper.you should also make sure you follow up with them. post cards are good option since they are in expensive for the quantity you can buy through sites like vistaprint.com

As a owner of a PM business you want quality rentals not quantity.