That's not any better than simply giving people their ship back with no cost. Increasing the cost of items automatically doesn't mean anything to anyone.
Insurance is in the manual (page 103) and your premium is listed in the right panel. If you are going to be upset by that, you're going to be upset as to why your laser don't fire after a while (overheating), your guns don't fire (no ammo), your heat sink doesn't work.
People can grasp the idea of ammo, people can grasp the idea of insurance. If they are old enough to drive a car, they can grasp the idea of insurance and have some idea how it works (and Elite doesn't even have monthly premiums, just a fee when you explode). If you're not old enough to drive a car, consider it a good intro to the concept..