absolutely.....this is how alot of high end clubs and lounges recoup their investment..through food. You see it all through south beach, NYC and other major night-life sectors.
You have it as a restaurant then turn it into a lounge/club after a certain hour. If you have a good menu and atmosphere, assuming you can generate sales....it can be very profitable, of course this involves alot more staff and resources.
you have to hire chefs, servers, busboys and managers etc. As well as deal with food inventory and all the associated licenses.
Honestly, it depends if you feel you are capable of turning it into a restaurant that can reflect the image of the bar. If you're limited by kitchen space or whatever, it may not be worth it.
Your service and theme have to be consistent.
If it's a really nice place, charge 25-30 dollar a plate for entrees...get a great master chef in there and make sure your wine menu is well rounded
oh yeah, and attract high end clientele
