because it would be a lot more money. and honestly you would be surprised how little laser is used because of the fact that u need almost ideal conditions to use it effectively. most of the time cops use radar, this is easy to check even without a detector because of how large a laser gun is compared to a radar gun.
most people with radar detectors get tickets for one of two reasons, they were cheap or they think that now that they have a radar detector they can stop paying attention and drive however they want. they are an aid in your driving.