Actually my friend has over 100 motorcycles insured with a state farm broker and he pays about $5 a year per bike and they are all restored old Triumph, BMW, and some other custom bikes. A lot of Ducati's and so on.
Insurance is a ripoff for most of us. He had 3 bikes stolen out of a trailer about 8 years ago and State farm paid him way more than he wanted because they said they found that that bike in that condition sold for that amount recently.