Don't mean to side track - it sort of on track - but Kathy Lare's husband Rob had taken the aluminum replica KBars sold as letter openers and added a leather sheath with the EGA and sold them as sgian dubhs.
I love mine. Its decorative, not functional, but that distinctive handle poking out of the top of kilt hose certainly sends a loud message.
To stay on track, I don't know that he's experienced huge sales. Just me, but seems the KBar sgian dubh would sell more than a similar kilt pin....?

Ron
Ol' Macdonald himself, a proud son of Skye and Cape Breton Island
Lifetime Member STA. Two time winner of Utilikiltarian of the Month.
"I'll have a kilt please, a nice hand sewn tartan, 16 ounce Strome. Oh, and a sporran on the side, with a strap please."
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