boatinjoe, I believe APBA's shedule was in concrete before SBI's on most accounts if not all, so you comment is a bit biased.
SBI and APBA never really competed before. Their venues, courses and general racing conditions have been very different. (especially thier Superboat class). Many people races both sanctions. Now it looks like the new Force/SBI thing is trying to be a joint venture to compete directly against APBA. At least that's the way things are starting to look.
I am not a racer, but I am an active spectator. I will go to the APBA races because I like head to head racing; much more exiting to watch.