I live in asia, one of the top U23 amatuers here recently went to belgium for a few months to train and race. He said there was literally a race every week. the club rides/group rides were being ridden at a level he felt was more in line with racing. and he was actually shouted at for being a 'poor bike handler'. was a real eye opener and a bump down to earth for him.
belbium racing is not only spectacular and well supported, its also bloody hard. would explain why they have the hardest of hard men and the hardest races!
I think there might be more than one race a week for amateurs in Belgium.
Not sure your hardest of hard men claim stands up (or hardest races for that matter). Tom Boonen MSR anyone? The point being I don't see anything to convince me their riders are harder.