You're right. They're including multiple tickets, snacks, etc., methinks. But, also, $15 is too high for the experience offered, IMO.

As of 2025, the average price of a standard movie ticket in the United States is about $11.50, though it varies widely by city, theater, and time of day.
Big cities (New York, Los Angeles, San Francisco): $15–$20 for a standard ticket
Midsize cities (Denver, Dallas, Atlanta): $12–$15
Smaller towns / rural areas: $8–$11
Premium formats (like IMAX, Dolby Cinema, 3D) add extra costs — usually $3–$7 more per ticket.