As I said in my initial post, I feel the RMAF event will be of benefit to the community. I also do not feel that it will have a major impact on attendance by members or vendors on CanJam'10. Any loss due to some choosing to go to RMAF will likely be more than compensated by increased exposure to a larger audience.
My only "concern" and it is minor, has to do with branding. If they are marketed as CanJamA and CanJamB then the inherent message is that they are varients of the same thing and not independent events with their own unique advantages. Perhaps, it is good that I am not in marketing.