I can go to any movie I want at any local theater. That is a lot better than subscribing to five different plans, one for each theater.
If you're visiting the cinema very regularly, this saves money.
They can do this because they own the theatre, so when a subscription is used, it only costs them the _opportunity_ cost of one seat - which is very little, unless the showing is sold out, and they still make money on snacks. As MoviePass doesn't own the theatres, they pay the _retail_ price for every ticket a subscriber uses.
2) with reserved seating, I'm much less likely to buy a ticket if the showing is almost full, so those filled seats can reduce additional ticket sales.
I sure hope that Moviepass and the theaters can figure out a way to make it work.