You don't have a 90ft wide screen at home with dual laser projects in a perfectly dark room and a real Atmos (as opposed to the gimped consumer version) sound system.
No i have a smaller room so i sit closer, so i have no need for such a large screen.
Plus i can sit in exactly the ideal location for the sound system and screen, whereas most of the theatre audience are sitting outside of the optimal seats.
Also theatre experiences differ significantly. Some of them have much smaller screens, lousy sound systems, dirty, smelly, crowds of kids, uncomfortable seating etc. There isn't a decent one around here, i have to travel a significant distance for a decent theatre experience.