He definitely thinks the M90 is worth more parted out than in one piece.
I saw a website for a parts store that still showed JVC parts listed although they were long out of stock, and that price for the front cabinet is about $30 more than what a new one would cost if they were still available, and the Antennas were $40 each, so he's pretty optimistic on those, too. The cabinet front doesn't look bad, though...
New woofers were listed around $80 each, if I recall, so he's really optimistic about those!
He's also selling a decent looking Sharp GF-9090 at a not-too-unreasonable price.