Bill Tanner my first campaign was 1600 pieces and I got total 8 responses: 3 super annoyed, 2 polite "You're a nice guy but I wil sell only for N times what you ask" (and the properties were not worth even the half of what they were asking), 1 pretty motivated owner but landlocked, and the other 2 theoretically still to be determined but truth is that I don't think I'll close on them for a bunch of reasons (title issues, almost 0 profit etc).
As I also think that I didn't price all of them correctly, I decided for my second campaign (other 1600 pieces) to opt for a more granular approach to determine my offers and, still so, i think I could have done better. I'm learning, aren't I? ...let's see what comes out this time
Keep in touch Man and let me know how it goes!! You can find me on fb as Arturo Paturzo if you want (I'm on Retipster facebook group too)