One of the nice things about blogging is sometimes, people email you or drop by in comments, and say the most enlightening things.
Check out the interesting discussion in this set of comments, on how the category system and upgrades work in cross.
I've raised the issue of guys flat out sandbagging, and guys who have to do something that looks like sandbagging in order to get enough points to be able to race legitimately in the class where they belong. Chris and Darren have a great discussion of it that is enlightening, which also compares the road and mountain category system at the same time.
Thanks gents. That was a good discussion of the issues.