Unless Jelsoft decides they want to allow x10 to distribute it, with royalties, in Fantastico . . . but it won't happen =(vBulletin isn't free so it won't ever be in fantastico.
But no one wants to pay $130 USD for a BBS and pay extra on top of that each year just to keep it updatedYou can just buy it like I did, x10hosting has all the necessary software to run it.