If you already know what you need and are OK paying more for it here than any other place... proceed. They want to sell you anything regardless.
I asked to have one tire patched. The manager was unable to give me any estimate for over 20 minutes until my car was on the rack and the wheel was off the car. I asked three times how much patches cost. He reluctantly said they average $30 eventually. So mine will be less? "Well, ummm... no"
No shit, my tire is an above average achiever. After the tire engineer inspected my tires his opinion was that it couldn't be fixed because it was too close to the sidewall. I found this amazing given I could see it was over 1 inch from the sidewall into the treads. The manager then pushed a full set of tires my way for $850. He was surprised when I had them put it all back and I drove away.
btw - The same set of tires at another shop was $700 out the door. The other shop also patched my tire for $20 and laughed at this story.