Maybe this belongs in the LEED thread, but I have never once even contemplated buying something that would sharpen a knife.
"Oh look, knife is getting dull"
"better put a new knife on the list"
Boom! New knife!
I know, some of you are going to tell me that you don't just go and throw away high precision super sharp surgical type knives with super awesome Japanese handles. I say to those ppl, I have been cooking longer than many here and have never had need for a knife too expensive to have to worry about replacing it's dull ass on a whim without thought or reservation.
Just seems weird.