2 points, the number of riders dosnt really change with the number of class's, the average of riders seems to be static over the last 6 or so years. Watching 2 or 3 bikes in any class is a waste of time and the organisers need to be mindful where possible, the other thing to consider is that small wheeled machines can not race with large ones under the GCR's( and yes I'll stand corrected)
otherwise, it all about the fun, and if it works, go and have fun
Cheers Worms