insurance value

I just paid Haggerty $255.00 for 12 months this afternoon for my 72 Duster 340, I took the online quote, the machine spit out $17,300 as an average value, 4 years ago, I had it at $10,000, The rep called me back questioned why I up'd the value. I told her thats whats popped up on your site, she didnt question it anymore, and left it at $17,000 all in all I think Haggerty is the way to go,