I really like neck carry, especially smaller fixed blade knives, and the BK14 is one of my favorites. I always carry point down, and unless I'm doing something involving archery, I almost always have a knife hanging from my neck.
I'm just not cool (or perhaps coordinated) enough to do the tactical tip up, tear it out of sheath and slash out to save my life and the lives of the school bus full of children who mysteriously appeared behind me needing my protective ninja operators moves, so scandinavian fisherman carry works just fine for me. I've rigged the factory sheath so that it hangs handle up blade down, and its worked out very well for me.
I'm sure its possible to dull the blade on the sheath (I have the new style, which is shaped differently, and reportedly has less fiberglass in it??), though that hasn't been an issue for me (maybe it would be if I spent some serious practice time on ninja quick draws). I just grip the handle, apply a little pressure with my thumb, and it pops right off, sliding against the spine of the blade, the edge makes minimal to no contact with the sheath. I have noticed that on occasion when I sheath the knife, the curve of the blade will bite into the plastic, so I'm sure that eventually it would dull the blade, though in all honesty, I'd like to think I use the knife enough to dull it before sheathing it causes real issues. I suppose eventually, the sheath will need to be replaced, but thats probably something my grandchildren will need to worry about.
Anyway, my advise would be to get the knife, try it out, and based on your own experience with it, modify/change the sheath to suit your needs, you really can't go wrong, its a great product and an incredible value.
Erik