Butch,
+1 HUGE agreement on the challenge. these things can be downright frustrating, but it's fun.
I took it to mean "4) kitchen knives wear out quicker then other knives do."
I highly doubt that any of the big ol' bowies I'm so well known for will ever be sharpened as often or as aggressively as a chef's knife.
Meaning that eventually you will run out of useful knife due to sharpening, either the edge will get to thick (can be thinned) or the blade isn't tall enough to clear knuckles, or you get into soft areas that won't hold an edge, etc.