"I don't mean they won't even look at it. I mean that, even if they were intrigued by it so much they were considering purchasing it, as soon as they find out it has no GM, they will decide not to get it."
People also felt that way when the 2nd edition of Warhammer 40K came out. And the game somehow survived.
I suppose it's really up to the players and the game itself. I've also made a GMless rpg so that I could take part of more games as a player

Some liked it, some went along with it, and - of course - some didn't want to try it.