Looks like somebody bought it.
Tough to say what will float somebody's boat. I've done some work on some pretty expensive pieces here, and have spent some pretty serious money on a couple for myself. Sometimes you see something and you just gotta have it, cost be damned.
I don't think Warmoth is taking undue advantage, it's just that some pieces of wood are rare. Ebony, for example, rarely exists in a form that can make an entire neck. It grows kinda scraggly, like a crabapple or olive tree. Finding a long straight piece with any girth to it just doesn't happen very often. I'm sure some of the other exotics are the same way. Ziricote comes to mind. I've got a one-piece neck of that stuff. When's the last time you saw one of those, if ever?