You pay for a diagnosis first, then the parts and labor to fix what is actually wrong, not a flat guess based on the size of your door. That matters more here than in a newer subdivision, because houses in this area went up anywhere from 1950 to 2004. A torsion spring sized for a 1982 build is not the same part as what goes on a door from 2001, and the opener hardware behind the wall is not either. We quote the job after we have opened the panel and looked at the track, the drums, and the cable condition, not before.
With median household income in this area at $96,725, most owners we talk to want the door fixed properly rather than patched cheap or replaced outright before it is necessary. That shapes how we quote jobs, favoring spring and cable work over full-unit swaps, unless rusted drums or bent track make a replacement the only real option left on the table.
What you are not paying for is a sales pitch toward a full door replacement when a spring, a roller set, or a new sensor solves it. Replacement gets recommended when the drums are rusted through, the door has been rebuilt twice already, or the track is bent past pulling straight, not because it is the easier invoice to write.