I'm not sure if this is currently being done (couldn't find anything on Google about it). When developing sites there are always security issues to think about. What if you could hire a hacker or even a team of hackers to hack your site and inform you of the security holes in your system?
I heard about this a couple years ago but they only did it for massive companies and charged in the millions for it. If someone could find a cost effective alternative then I think it would help a lot of webmasters!
P.S. If someone decides to develop this then I get a small finder's fee. I would do it myself because I think it's a great idea however I have other pressing business matters to worry about.
www.hire-a-hacker.com is available.