My question is this: let's say everyone with access to the internet used your site and reported all the bribes they paid, how will this help change the situation?
I see it helping in few ways. First, it provides a quantitative look at it, so you know what your corruption tax is going to be. Second, there are regional variations, so in the medium-term, people can respond to this information to make better choices (yes, it is everywhere, but how bad is it?). Third, in the long-term, this can potentially impact governance. Public perception can be powerful, so I could see progressive entities trying to get off these websites.
In addition, we believe there are people in the administration who want to change things. To cite a success story for http://ipaidabribe.com/, a similar website
"Several government officials at different levels, some of them horrified at finding their department high up on the list of bribe-takers, have contacted Janaagraha and asked for its help in building better structures. One was a commissioner of a transport department, who realized that he could reduce corruption by minimizing the number of touchpoints between citizens and officials."
(taken from http://www.theepochtimes.com/n2/world/indian-website-uncover...)
That said, this is an experiment. It will take some time before we can gauge the success of our initiative.