A drive-in is kind of a novelty experience. I won't say it's "better" than a movie night with friends at home if that's all someone wants. But I do think it's more enjoyable for a group of friends than an indoor movie theater experience. When I go to the theater with friends everyone kind of just dissapears into the crowd once the lights go out, for the most part. It also gets people out of the house, and depending on what of events/concessions the drive-in offers you could have alot of fun with that. Today may be an stay-at-home age, but more people are at least trying to get out more for their nightlife, and social experiences are gaining more and more traction.

That's also why people don't know all.their neighbors on the street they live on anymore. Everyone stays home, kids sit around playing games on line etc.