tl;dr I was wrong.
I used to go to a restaurant that I was sure was a front.
Years ago I was walking home from the gym and I got peckish. I was in one of the less fancy areas of Manhattan so I didn't think twice about just walking into the first place I saw.
The second I walked in I decided it was a big mistake. This place looked fancy. Nice place settings, real wood furniture, etc. I was dressed like a bum and probably smelled bad.
But the head waiter came out and treated me like royalty. Fresh baked bread, a sauteed flounder that he filleted right at the table and all around baller service at a very reasonable price. I was the only person there but it was early so I didn't think much of it. I figured that if their food and service was this good when they thought I was a bum this is the place for me. I dropped a 100% tip and decided I'd go once a week and if I ever found a date I'd impress the hell out of her when we roll into a nice restaurant and the head waiter greets me by my first name and treats me like a big shot (aside: the first and only girl I brought there didn't like their vegetarian options but ended up marrying me anyway).
Ever time we went the place was practically empty. This was one of the less fancy areas of Manhattan but they were still paying Manhattan rent. The food was always top notch and did I mention how awesome the service was? Mooci, the waiter once came back from vacation and insisted that I try some of the moonshine from his Sicilian Mother. Constant freebies too.
We decided there's no way they could be turning a profit and assumed it was a mob front. Some older NYers may remember when the story broke that SPQR was a mob front, so it seemed pretty likely.
Well a few years ago we went back after moving out of state. The restaurant was under new management and everything sucked. Crappy place settings, shitty generic food and I didn't recognize anyone there. It turns out they weren't a mob front. They were just great cooks that sucked at running a business and ran out of money :(