i agree, doing high rep sets of crunches is probably a waste of time and one would be better served by doing heavy weighted crunches or just letting squats, deads, OH presses and especially chins take care of their ab development.
abs arent built in the kitchen, they're revealed in the the kitchen!

i get a huge kick out of society's obsession with "abs" and all the stupid little useless devices hawked on TV "guaranteed" to give you a washboard stomach. it is truly amazing how many people still belive you can "spot reduce" by doing hundreds of reps of twists or crunches, etc. or, to quote Dorian Yates "By rocking away in a flimsy plastic jigger", lol!
it is my experience that a vast number of people think pro BBers walk around all year long with 4% BF, looking just like they do on the Olympia stage and those same people believe that anyone who lifts weights should also look like that all year long.

in the last 6 months i've added almost and inch and a half to my arms and almost 3 inches to my legs and all my mom can say is: "why dont your abs look like Arnold's?"

*sigh*

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