The linked article actually says how much he paid:

And all things considered, the experience was not nearly as expensive as you’d think. The movie buff owns a Regal Unlimited card, which charges roughly $28/month (£21/month) for a seemingly infinite amount of films. He also would prepare food at home, and eat it between showtimes to save money – and he even got some use out of the grounds around the cinema, by going for his daily exercise between flicks.