Comedian Louis C.K. made headlines in June when he announced tickets for his fall stand-up tour would be sold exclusively through his website. Rolling Stone speculated that the artist-controlled model might offer a new way of doing business for traveling entertainers of all stripes. But Travis Janovich, the founder and CEO of Morrisville-based Etix.com Inc. — the ticket platform C.K. uses to process sales — isn’t so sure the comedian’s gambit signals a sea change.