Warning! Coarse language ahead... my apologies in advance.
I suspect that Will's point is, if it's a well-designed, well-built knife, "extras" like mosaic pins won't do much other than add cost and "pretty-factor". Nothing wrong with that! If you want a kick-butt knife that's prettier than your neighbor's, more power to ya. Fine details/options require skill, and they should be evaluated with a skeptic's eye. All that glitters, is not gold.
I haven't sold a single knife on this forum yet, though I've sold a couple to friends/acquaintances. I'm currently spending my time "throwing away" several prototypes that I'm not quite happy with. When I feel my knives are worthy for sale, I'll run them up the proverbial flagpole. Extras like mosaic pins have nothing to do with the usefulness of my knives, they just add cost and beauty. Again, nothing wrong with that, if that's what the client wants.
I believe most custom makers put bread on their tables by selling very-well-designed, excellently-built, extremely reliable knives; they put butter on their bread with options. Never forget that the "bread" comes first. That's my personal business model, anyway.
HOWEVER! If it's a crappily-built knife that looks fantastic, but doesn't perform well... all the mosaic pins, pearl buttons, extravagant handle material or diamond inlays in the world don't mean $h!t. High-dollar collectors (the folks who are willing to pay for extra engraving, exotic materials, and the like) are seldom fooled by a gilded turd.