I bought through carmax and I call it dealership lite. They tried to finance me even though I already had financing (and I said no) and pushed the extended war

I bought through carmax and I call it dealership lite. They tried to finance me even though I already had financing (and I said no) and pushed the extended warranty pretty hard. It is like $5k for 150k miles. I've heard you should buy it if you go for a BMW, jaguar or other higher maintenance car.