Joking aside, it seems they do make huge piles of cash. From this Mark Gurman report in Bloomberg:

Regular stores typically generate more than $40 million annually, while Apple Store+ locations bring in over $45 million, according to internal data. The flagships generate more than $75 million, while the flagship+ sites make over $100 million annually.

Unsurprisingly, Apple is working on a lot more stores, according to Gurman.