Endoqwest, I think the answer, if an off-road race series is to be truely successful, would be both. If the riders like the course,and the race is well ran, they will be back. If the Media and spectators like it, it will gain noteriety, and will more likely be ran again too. We are facing a lot of adversity from outside the sport in the off road racing world. The more fans and allies we have, the longer we can survive and the stronger we can become.
Look at GNC Flat track racing. It's fan and media support keeps slowly eroding. And the sport, as great as it is, is in pretty sad shape.
Cross country forms of racing are inherently difficult to observe as a fan, but I have been to some that have kept fans in mind and are fun to go to observe. If you are accompanying a friend or your kid to a race, it is a lot nicer if you can stay involved by watching at least some of it and have an idea of what is going on. Any racer will tell you that it stokes them a bit more to have an audience.