Yep, we have really expensive fashion boutiques on the promenade where I live. Nobody seems to enter and shop there. Ever. There's usually a shopkeeper, female, who sits there all day, adjusting the clothes.
A lot of investment bankers’ wives open up fashion boutiques that see little to no business, it’s a write off for taxes. Not technically a front in the strictest terms.
... and once every three years or so it turns into a solarium or something for a couple of months and then reverts back to a boutique.
At least that's how it works here.
We have those too, but it's too central and high-profile for them to be fronts. I've just assumed that because they're so obscenely expensive (which they are) they don't need to sell much volume to turn a profit.
It's a shame though, because it's a really nice area, and there used to be a bunch of shops there that were reasonably priced, so us mortals could shop there. It was bustling, now it's crickets and rich people.