Well, actually the veneer slicers pay the most for the best stuff because their yield is so high. The guitar guys get lucky sometimes... but then again we'd need a pretty large billet to make a jumbo archtop, but only thin stock to do a flat top acoustic (for the back and sides.)
As to rarity, it's not exactly rare. It's rare that it gets cut up into billets suitable for guitars or cues. Here where I live there are many streets lined with them. There's still plenty of Brazilian rosewood trees; they just can't be harvested.