Re-releases

I've had this question for a long time and really want to get an answer to it.

Why are there so few movie rereleases? Is the decision from the Theatres side or the movie/distributor side? I feel like there should just about always be old movies in theatres, I can't be the only one who wants to rewatch or watch for the first time a movie I have missed!

Most of the time (in theatres near me at least), most showing are practically empty, why not remove a few and bring back some old movies that could bring more people.

I always look for movie rereleases and have watched both Interstellar and Se7en in IMAX in recent weeks and I have loved them both. There are not enough new releases per week and I feel like they can spare 1 of 2 showings that will not sell many tickets

Surely its a win-win for both theatres and the movies themselves?