You can tell a PM from an individual and if they have a large quantity of properties listed they may be your person to talk to.

Have a strategy, implement a plan, and remember, quality over quantity when it's in front of the right audience. 

They generally do not.While I found his attitude a little insulting (essentially saying that all tradesmen go out and drink their paycheck Friday night and are too hungover to work on Saturday), I did like the concept of looking at what they are invoicing for, comparing it to the quality and quantity of work actually done, having a few days to make sure it jives and then cutting checks.  

Do they have to be brought in quantities?

If you are buying in larger quantities, you can ask them to run it through the pro desk at HD to see if there are any additional discounts.

That being said, mass quantities of people (probably over occupancy standards in your area) or having two large dogs - neither are protected classes.

Little by little I've been increasing in quantity and size of my purchase. 

When I said massive I mean like large quantity of homes being rented out.

The issue regarding harmony, or the seeming (and hopefully temporary) lack thereof, came about when we began to define our criteria for our first deal.

Approximately what quantity of emails/deals did you receive and how regularly?