Blade collectors are more finicky than we are and the K98k collectors I know won't touch a sharpened K98k bayonet for hardly any price. Too many nice I unmessed with bayonets available.
+1 on Ham's comment!
Then again, if you have a '45 dated bayonet, it's being sharpened wouldn't make much difference. I'll take it!!!
So would you rather have an un-sharpened bayo loose or a sharpened matching one?
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I add the early omc (39-40) bayonets to the list of exceptions to the "no sharpening" rule as well. Maybe early bym too.