Well, let's do some math
BP = $7500-8500 lately
Grenade - these are all over, let's say $2-3K, more depending on version and condition.
Clamp and bubble strip - we'll say $500 for the combo just to make the math easy. Exactras are in the $250ish range right now.
Booster - $2-3K seems about right too.
Handwheel - $3-400
Transistors are basically free - looks like motorolas on the one in the auction. Whatever, no one has the right ones yet anyway.
<gets out calculator...>
If we use the high numbers there...we get $15400. You definitely pay a premium for getting it assembled and ready to roll all at once. No hunting for years for parts, no joining forums and learning the "in" crowd, you just write a check and you're done. That's worth quite a bit, really.
Extra bonus points for it coming from a known source, not some sketchy forum where you don't really "know" the people until you hang out for a while.
For a collector with the cash who doesn't "love the hobby" to the point where they want to spend years tracking this down, $17k seems like a cheap price of admission. Wait until the Obi show comes out, especially since we know there have been some insiders trolling the forums and getting some real parts that may or may not end up on screen.