Home Inspector or Service Warranty?

Why do buyers chose an inspector for $300 vs. a 1 year service warranty for $500 that includes a pre-inspection? I had an inspector come to the home I purchased. He had a long list as it was a home built in 1925. The Buyer's Agent then proceeded to tell us, "This house is a bargain. Don't bother to ask for this stuff to be fixed by the seller." but then 6 years later when another inspector came, the same agent was saying, "You should get this stuff fixed." We are buying a house now and for $65/service call the appliances, furnace, air conditioner, etc. will be fixed. Okay, it's a 20 year old house, not 75 years old, but isn't a service contract a better choice for newer homes?