My gf's cousin owns a restaurant in a very busy place where rent is high and that person does sell some other things on the side (seen on display in the restaurant) to cut down on rent expense.
(not food related, but still not a bad idea...)
Hey? HARD ROCK cafe had a store...that'a a large company, not a little guy, but at least they were only forced out by a major rent increase and not by anything else.
(They also left the Rogers centre years ago...hopefully that was also rent related)