No need for that many strings..
everyone is going to do it eventually
Even If the market is only 30% the poll shows on it's results, there's plenty of people that would buy one of thoseI'd rather buy a standard, mass produced, quality 9 strings guitar than a insanely expensive custom guitar
I think that it's pointless because many of the guitarrists out there can't even handle a 7 strings properly, and ... for extended range it's more than enough with a 8 strings D:
Sure if there is a market - but honestly 6 is still emough for me :-)