Pitch affects roof geometry and can influence access, work methods, and the selected system. Two buildings with similar floor areas can require different roofing scopes. Pitch is one input, not a complete explanation of price.
What to do next
Ask the contractor to explain the measured roof and access assumptions. Compare materials and included details as well as geometry. A useful estimate shows what work is being priced instead of attributing every difference to the roof's steepness.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.