I have had that response from them before, with multiple books having minor CT. In my experience, it means the value of your book will be higher the way it is now than if you remove the resto.
Example: I had 2 TTA 27's... a 9.0 PLOD, and a mid grade, both with minor amateur CT. They declined to work on the first, agreed to work on the second, and basically cut a small hole out of the center of the comic where the touch was. It still got a 4.5. If they'd done that on the 9.0... it would be maybe a 5.0? Not good.