It only takes a simple call to Benchmade to see if they sell blanks.... the worst they can say is no. Personally, I would never sell a blank(unless is was a collaboration with a trusted maker). If someone takes one of my blades, sticks a rubber hose over the tang with a pool clamp, then posts pics all over the net with my mark on it.... well, it just looks like I make knives with rubber hose handles.
Hmmmmmmmm..... rubber hose?.... thinking, thinking, thinking...