The thing is, Nick Kokonas has mentioned this a couple of times, Alinea's very much close to break even due to the level of ingredients and preparation that goes into every plate. I believe he said they wouldn't be profitable without the wine pairings. El Bulli was the same.
I mean, think about it, the seatings for 2 take up at least 3 hours. Your seating for 4 took up 5 hours. You open at 7, it's not a particularly large place, and you can really only do two to three waves a night.
They put out a video into the preparation for the Hot Cold Potato, and it was a ton of effort for one fun bite.
Shared plates places - like The Publican - are much more profitable apparently.
But tasting menus are more than about the food, although it's absolutely great and, when you're eating at Alinea or The French Laundry, you're certainly enjoying the best ingredients. I mean, damn, look at those black truffles. Eating is one component of it.
And Alinea is in no way stuffy, based on people I've talked to that eat there. Chicago as a whole is not a stuffy dining experience at all, unless you're eating at Naha or Everest.