Sandbagging makes the forced pulling that seems to be popular this year more draconian. Basically, it should be one top 5 and your out of the 4s. The guys who are on the podium in the C races around here know how to win - they're usually winners from crits and road races.
There will always be new, super fast guys coming up through the ranks - but I've seen those guys and as soon as they're doing well, they upgrade. That is not the problem. It's the guys winning Cat3 races on the road (or yes even Cat1, I've seen it), who shouldn't be there beyond one or two races to get their bearings (which I doubt they really need).
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“Courage is going from failure to failure without losing enthusiasm." (Churchill)
"I am a courageous cyclist." (SpongeDad)