Would you adopt 10% rule for the car insurance?

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So, somebody advised me to follow the 10% rule whether I should buy a full - coverage car insurance, or only the liability. With 10% rule, you might have to found out the current market price for your vehicle. You can go through websites like kelly blue book, or edmund.com to find out your vehicle market fair price; simply input the required information they need to know. Then, you multiply 10% of that market value, and compare to the current insurance premium you are paying now, if you opted for full - coverage. For example, if you car's market value is $4,000, and 10% of it will be $400. If your car full - coverage price is exceed $400, it is not worth the paying for six months. You might consider switch to liability only. What do you think? Do you think this method is worth to follow?