What a job costs depends mostly on what is actually broken and how old the hardware is. A single torsion spring swap on a door from the 1970s-90s era is usually straightforward because the parts are still common sizes. Where it gets more expensive is when the opener, the track, and the springs are all original and one failure exposes that the rest is close behind - we will flag that rather than let you pay for one repair and call us back in three months for the next.
We do not quote a flat number over the phone before seeing the door, because a bent track versus a snapped cable are two very different jobs even if the symptom sounded the same when you called. Given the income range in this area, we try to give people options - fix what is broken now versus replace the whole unit - rather than pushing one answer and hoping it lands.