The first Z i had was when I was 18 and had a few tickets on my record. I was high risk and had full coverage andit was 3k every six months. My agent couldn't believe I agreed to pay that. I was his single highest premium he had ever had. High risk + high performance car + 18 yrs old = Big Insurance bill

As far as the miles... yea thats an assload of miles but high mileage doesn't bother alot of people. If the engine takes a crap on you rebuilds are pretty cheap if you are handy with a wrench or have a friend who is.