I would be interested in being a beta tester.  I should note that I was a marketmaker for Matchbook when they were in the US market.  Their definition of marketmaker was offering at least $500 on both sides of all events in a particular market.

That leads me to a couple of questions.

1. Your rules look to be copy and pasted from Matchbook.  Are you affilated with Matchbook?
2. Are you going to offer credit accounts?  Credit and lower commissions are how Matchbook attracted their marketmakers and without the two volume will be very low.