Wow, people are getting all philosophical and stuff. As was stated earlier for every person who hates the skull there are probably a few people who would buy it. Not necessarily the knife nuts on this forum but the general public. It's just a decor item, like it or don't, no voodoo included.
It's certainly more fitting than butterflies or some other random object, to the genera. Skulls go along with guns and knives as well as any other decorative item I guess. Take the wide use of the punisher skull used in many areas of gun gear. From magazine floor plates, to AR dust covers, pistol grips to Chris Kyle's SEAL team spray painting it onto their hummers and body armor. I'm not going to be the one to tell SEAL team 3 or the Army's 24th infantry that they are being too "tacticool".
The main thing is that this is a product, meant to be purchased by someone. Protech puts out a model called the tactical response knife, and I just checked on blade hq, more than a couple of the SOLD ones have skulls on them, so someone's definitely buying them.
Personally the knife isn't my style, however skulls or not, I wish them the best of luck on this project.