Terrific article, Mick. I think not being able to enter irritated me firstly because of the plainly stated "No self-published" but more so because of the inconsistency in the way that rule was applied.
Although the concept is a great one - reaching out to the small guys, the undiscovered - the organisers are either naive, time-stretched or do not have deep knowledge of how publishing is evolving.
There are wonderful books out there; well-written, well-edited and covering areas and subjects not picked up by the traditional publishing world. And readers are buying and reviewing them in droves.