I've been thinking about this for a while. Instead of subfolders how about utilizing sortable tags, which have to be declared by the thread-starter prior to publication. I would use the some variant of the following:
Grand Tour race
Pro Tour race
Championship (world and national)
Major continental
Minor continental
Predictions
Gossip and News
The advantage of this is all threads are still in one folder, but organized such that each member can filter out the topics they find uninteresting. For example, someone more interested in the spring classics than my silly early season predictions can click on ProTour and see on page one only those threads.
Further, I would only make sticky the next race(s) coming up, to be unsticky after full results have been posted. perhaps also set a requirement so that Jr Members (and people inactive for over 4 months) can not post new threads without approval.
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But if you are going to use subfolders, how about this:
Lance obsessive (both pro and anti)
all others...