Tracker for what?

For the life in me I do not understand why insurance companies requires a tracker device to be installed??? This is on my personal vehicle, so I'll maybe use it every other weekend, the rest of the time its locked in my garage at home. Earlier this year, the battery ran down due to lack of usage so after 1 week of it being 'off-line', I phoned them and kindly asked them if they could tell me where my car was currently-and they couldn't which aggrevated me beyond words. Recently its being repaired so the battery was disconnected, after 3 weeks I received an email asking me if the car is being used as they haven't been receiving any updates from the vehicle??? 3 weeks, do you know what can happen to a car in 3 weeks? If it was ****** you'll never find it-so,I ask you? What am I paying for? Clearly theres no added service or protection!!!!!!!!