Mine are all covered 100% and my implements as well as any grain or animal feed (hay) I have stored on the farm against all perils.  Having said that I still don't want to suffer a loss because I need both of them or I wouldn't have them.  Not for 'recreational' use, they are working units on a working farm.
I guess I'm not all that paranoid about loss however.  Out here I often leave the keys in the car or pickup truck, in the tractors too.  We don't lock the doors at night either.  No need.  We live on a farm and it's remote here, devoid of people, thieves and idiots.  Besides, like most locals, I'm into firearms and regularly open carry and I always have a handgun in the tractor anyway.  If that isn't enough deterrent, I have a large (120 pound) black chow lab with a nasty disposition.  He don't cotton to strangers very well and he has the run of the place.  he does like the local UPS driver.  He always has a biscuit for him....
