Seriously. You only insure Warranty deeds (OK, and Trustee deeds) -- the point is, Title Insurance is used to provide the Warranty to guarantee the Promise that the Grantor is actually delivering An Interest in the Property.
So, you wouldn't insure a Quit Claim deed, because it doesn't promise that there's any Interest being transferred. It just states that, "If I had a claim on the property, I now relinquish it to You."
But you would insure a deed that declares, "I own this property, and I transfer that ownership to You." Because, without that insurance, you have no recourse if the Grantor didn't really own the property.
Hope that helps,
Sometimes a house can have unrecorded liens against it. You could have an inheritance argument that puts ownership of the house in question. In each case title insurance both protects you and covers the costs to straighten things out.
Is title insurance needed? No, but neither is car insurance or house insurance. Yet those are considered a smart idea to buy just in case something happens. Every year someone has their house burn down and has no insurance. Every year someone gets in a car crash without insurance, and every year someone has title problems that cost them dearly as they had no title insurance.
Is title insurance a good idea? ABSOLUTELY!!! I will not buy a house without it. I do not think anyone should.