Why come no one is seeing the 2D screenings of today's 3D Movies? (i.e. Gravity & 47 Ronin)

[Hynad]

A lot of theatres push for 3D versions of movies. Where I'm from, most theatres don't even offer the 2D version of films if there's a 3D one. What's worse is that they charge more for 3D films than for those in 2D.