No. But I live in a town of 50,000 people. The worst thing crime-wise that's happened in the last year was a break-in/stabbing that sounded like a drug deal gone bad. Petty theft/bicycle theft is about the most common crime here. There is a university here, but the university boasts the lowest violent crime rate out of all the universities in its athletic conference (the PAC-10) given its location in a town such as ours.
I guess the disappearance of Brooke Wilberger here a few years ago would qualify as a crime that resulted in a reward being offered for information. And yes, she was a pretty, young Mormon girl, so I have no doubt that that played into the offering of a reward. But it's pretty conventional to offer rewards for information in the United States, via such programs as Crime Stoppers.
http://www.crimestopusa.com/ I read an article not too long ago that even suggested the amount of people snitching for rewards has increased, given the tough economic times in the United States. I'll see if I can find it.
EDIT: As Prices Rise, Crime Tipsters Work Overtime
http://www.nytimes.com/2008/05/18/us...prod=permalink