Collector car insurance

As for Grundy I have had them for the last 18 years and every year it goes up. I started in 2004 at $137/ year and now it is up to $291/year and every year they increase my premium along with the total loss value of my car which in a good way is good but the replacement value they have me at is actually 2x higher than the actual value of my 71 Duster that I would take if I were to sell it so for the same coverage and my agreed upon value I saved over $160/year by going with American Collectors Insurance...