I work for a company that made radar detectors. Thankfully we're getting out of the business --I could tell you some horror stories about drivers out there. I don't know if cops are more likely to ticket you if you have one--they generally have picked you out for speeding way before you are close enough for them to see if you have one and only use the radar/laser to get a speed reading without having to pace you.

Regarding 8-10 mph over posted speed limits, that may have been safe before the days of cell phones. Too many drivers are driving distracted to be speeding at the same time. We very recently had an accident on the freeway near my office where a driver was doing 70 mph (only 5mph over the 65 speed limit) who was "distracted" and didn't see the stopped traffic ahead in time to hit his breaks. He slammed into a car, killing 4 of the 5 passengers when their car went up in flames and sending a 4 year old boy to the hospital with severe burns. If that doesn't make you think twice about speeding, I don't know what will.