I'm not quite sure, but I tried this once or twice and figured, that you cannot win money by escaping the police. The fine is just here to make it more thrilling to really get away, I guess. So it's not something in the top 20 priorities but making it possible to actually make money out of escaping the police would be a motivation to actually get into police chases and stack that Outlaw-Reputation. I already have far to much OutlawRep and usually pay the fine just not to get more of it, but winning money though would be a nice motivation.