I don't tend to submit too many low-ball offers, and I probably have about 10-15% success rate on my offers (after negotiations, of course...the first offer is rarely accepted).

., long drives, run the ball, wait til 1-2 seconds on the play clock before snapping, every time).

So $7500, I don't like it, but it's probably in the ball park.

Blockage could be caused by a multitude of things already named, as well as silly things like balls or dead birds, or even a collapse of the pipe upon itself somewhere underground.

Then we, as a small group of three people, broadened our reach through MeetUp.com After a successful Meetup, we posted about it and thanked the BP community and it happened to catch Brandon's attention.He said he'd help us out and speak at a MeetUp and I think that really helped to build momentum and obviously Joshua joining us helped to keep it going.So I think once you get the ball rolling, you will find, as I have, that not only Joshua and Brandon but a lot of other people can help support it and grow it.

Broken plastics, the ball getting jammed somewhere, flippers not lined up right, etc.  

I don't want people to think they are renting to a dirt ball.

What advice for me do you have to get the ball rolling?

If all else fails, exercise the Happy Clause. 

Looks like 1600 rent looks like a good ball figure for rent.