I would never part out a bike. In fact, I have done the opposite; I've created at least 4 rolling projects with decent rebuildable core parts (chassis, engine & wheels), and built up another SIX Commandos to very decent running bikes right from scratch.
I do not begrudge anyone the free right to part out a bike, but it just doesn't "feel" right to me .
Where I take exception, but still of course cannot deny the person's free right, is when it is a NUMBERS MATCHING ORIGINAL that is being parted out. I have to admit, I once bought a frame and engine just to keep them together. I lost money on that deal, and if I were still buying and selling, I'd do it again.