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The point is, that spurs are a heavy handed way to make a horse do what you want.  A well trained horse (with a good rider) knows what to do and the spurs aren't necessary.  I, like EweSheep, would have no business wearing them...
I find this interesting and felt the same way at one time. But, what is the difference in using a spur or using a crop? For me a spur used correctly is just an extension of my aids. If I have applied my leg and not receive a give to that pressure, I may apply the spur lightly. With in a few lightly reinforced tries, the horse will usually move off lightly without the spur backing up the aid. I do not enjoy riding a horse that I have to thunk on with my legs like riding a stubborn little pony. (pony people, please do not take offense.)
The way I think of it is, a good cutting horse has an instinct with cattle not unlike a a labrador's drive to retrieve.  Good, consistent  training is what makes the difference with both.  You might want to use a crop to make your horse go faster for barrels or poles, but unless you are literally racing somewhere for some unknown reason (to the horse), I just don't see the need for either crop or spurs...