I do know about the regs regarding food, as well as beer/wine. I have work in the food industry for three years now, so I know it fairly well.
I know it begins to draw away from the tackle, but I dont see any other way. An average lure will bring the store owner $5. Thats a lot of lures just to reach store rent let alone for your house, and worms, if you do it yourself, are looking at 75 cents. Again, a lot of worms. I would imagine I would have to be a one stop shop, grab your tackle, bait, a sandwich and a case of beer. Beer and chips are going to bring people in, instead of just hitting the grocery store and dealing with the lesser tackle options for the sake of convienence.
I figure a few snacks, beer, soda, sandwiches, maybe soup in the winter, icecream in the summer, hot coffee year round. Maybe, if space allowed a bar or a few tables to sit and swap fish tales.