Your models, of course, are most valuable to you. For insurance purposes, however, they would carry replacement value, aka, retail cost. Your deductible is probably in the $500 range or more, home or car, so before you saw your first penny in insurance, you'd have to lose over $500 worth of retail cost, less depreciation, naturally.
Now, if you've been selling your models and have an established and documented price range, you could insure them for a lot. A friend, a well known scratchbuilder, has some of his models assessed at $80,000, (yes, eighty thousand US dollars for a single model). He also has a GPS tracking device hidden in it. For him, insurance makes sense. For us mere mortals, it wouldn't be worth the trouble.