For us, sit-down meals for two at a restaurant were usually at least $50 including tip.

I'm comparing Blue Apron specifically to a sit-down meal because for us the point of dining out was to relax and spend time together - something that cooking at least three meals a week together gets us to do. It also gets us to try ingredients we wouldn't normally consider.

That's just why it works for us, specifically! Definitely not for everybody. I don't work for them and the only stock I own is chicken stock. :)

They always keep right around 700 calories, which is pretty healthy for a dinner.

That's not the point. It means they are delivering the same amount of food (2 X half a portion), for pretty much the same price, minus the enjoyment of eating out. And apparently, they take about as much to make as a regular meal from the store.

EDIT: I think we are talking at cross purposes - I meant restaurant meals are usually plenty for two people.

Ah yes, I thought you were referring to the home meals as having two servings.