Cinemark gives you about a $1 discount for one ticket only when you subscribe to a monthly membership, which includes only that said ticket per month. It doesn't make any sense.
That's more than a $1 discount. It also includes add-on tickets at the same price (structured so it's basically unlimited viewing for one person plus optional guest at the $8.99/ticket price), concession discounts, and waiving of online ticketing fees.
It's not really anything like MoviePass, but it definitely makes sense.