While I don't specialize in band management or promotion, I have some second-hand advice as my boyfriend is a signed musician to a major label. From my understanding of your question, it sounds like they have some sort of following already - from here, I'd identify within the US or Europe where...
Retention - if you build something people want/use AND come back and use often, then you can usually figure out a business model to make it work (if there's a big enough market).
As a business owner I also feel that for someone to come in and take pictures would feel a bit violating. We've actually had competitors come in and take pictures of our store layout in the past in order to copy. If you're trying to get their interest with a custom poster relevant to their busin...