Yamaha may have a huge third party library, but honestly, since Mega voices came out, who makes third party styles that are as good as Yamaha's? No users that I've heard yet...
You want a bunch of styles that sound like a PSR from the eighties or nineties, fine. But I've heard little that sounds like it might belong in the ROM of a T3

And c'mon, guys... if the Wersi (already considerably more expensive than anything else) comes out with a 76 with a MORE advanced OAS than current Wersi's do, do you think for one minute it's going to be LESS expensive than a single manual Abacus? (What are they? about eight or nine grand

?)