It sounds like a battle between the Connoisseurs and the Contextualizists. I think the big reason you haven't got it in a gallery yet is because they're judging you prematurely. I've seen your work and although you have the social meaning, documentation and show what most people don't see (which is the functionalist, contextual side of your work), your work is also very stylistic, emotionally charged and has a "museum" aspect to it. I think you really need to prove to them that there can be a mix of the two. Your work doesn't look like something that belongs in National Geographic, it belongs in galleries. I think history will show that galleries are leaning towards being more open to artistic documentarians such as yourself, but some have just stuck to the please the connoisseurs and "those kind" of photographs. Keep trying man.