A tech calls you from a basement in Macomb Township: the water heater is shot, the homeowner wants a price and your tech is doing math on the back of a work order, guessing at hours. You give a number over the phone, and you are not sure it even covers the trip.
A flat rate price book gives every tech the same answer. Each task has a set price built from labor, parts, overhead and profit, with good, better and best options, loaded into the tablet so the customer sees choices before work starts.
Your techs present options instead of guessing, customers approve a price before the wrench turns, and the arguments over the final bill mostly go away. You know the margin on every ticket before it is written.