Airstreams are a weird product. Realistically any other travel trailer will match them feature for feature, at a much lower price point. Most other brands will have more space for less price, most are better featured.
Wearing your boring beige pants, Airstreams don't make much sense. At all.
But, looking at it from another point of view... No RV makes sense. Tents really serve the same purpose... So why do we buy RV's? Because we like them.
Airstreams aren't just a product that people "like". They're something that people fall in love with. Some people will never understand why Airstreams even exist. Other people would never buy anything else. They're really a product you buy because you're an airstream enthusiast. It's a product you cherish, and enjoy just for the sake of enjoying. It's a purchase you make with your heart, not your head. It makes no sense, but there is nothing wrong with that at all.
I'd never buy an Airstream. They just aren't for me. However, I'd never ever criticize anyone who has one, and the RV world would be a worse place without Airstreams in it. They're not for everyone... And that's exactly why they're so special.