That would be the hope, but experience shows that the severity of the crime seldom acts as a deterrent, because there's a philosophy that says the criminal doesn't believe he'll be caught.
It's interesting to look at the range of sentences for kidnapping in our judicial history where there's no minimum. The sentences, nonetheless, have been severe. By severe, I mean lengthy. The courts, to my knowledge, have always treated commercial kidnapping as a very serious offence, and in my experience the sentences have been 10 years and 15 years, so that the five years is not extreme. I think you'd have to look hard to find a case where a serious kidnapper was sentenced to less than that.