Basically, the idea would be to open a chain of ultra-hip restaurants that are like normal restaurants in every way EXCEPT that they don't actually serve food. In other words, you go through the whole ritual of making a date with someone, including the romantic gesture of "buying them dinner" and enjoying conversation with them over candlelight with attentive service and fantastic decor, but at the end of the evening nobody goes away feeling bad about having potentially gained weight because they didn't actually eat anything.
I'm thinking that the interior decoration could go with a dark mahogany theme. The service would be top notch, and we'd have a top-drawer chef create the weekly specials. Since no food would actually be served, the sky would be the limit in terms of the rarity and quality of the ingredients that could be used.
These would be pricey places, of course, but to potential investors I would additionally point out the tremendous cost savings realized in not actually needing the kitchen infrastructure to support the handling of actual food.
I'm not even joking, I think that in New York this could go over.