http://chicago.everyblock.com/crime/
Maps, charts, etc. ... but I don't see how it's monetized. They've expanded to other cities recently (see list at bottom)
And where do you get cash?
If your working closely with the Police forces etc. I suppose they might show an interest. But we work with police forces and I can tell you they are a pain to convince on "new technology" :)
Local councils (here in the UK) may be more welcoming.
Any attempt to produce "crime figures/data" for an area might be subject to a lot of bias.
(not that I think it's a bad idea; just some thoughts thatr occurred to me)
Why not give it a shot: if there is no one in the sector it doesn't mean it is a dead end :D (it might mean it is a tough climb though)