The service area sits in a cold-moderate climate band, and that temperature swing matters more for openers than people expect. Nylon gears get brittle in cold snaps and can crack under load on the first cold start of the morning. Motors that have been running fine all summer sometimes won't engage at all on the coldest mornings of the year, because the capacitor that was already weak finally gives out under the extra draw.
With a median household income of $51,111 in Roebuck, close to the $51,353 median across the full service area, most repair calls we get are about fixing what's there rather than defaulting to replacement. That's a fair instinct on a board or gear repair. It's less fair once the motor itself is the problem, since motor swaps on an opener this old often cost close to what a new unit runs.
Across the broader area there are 38,583 households and 21,429 owner-occupied houses, but Roebuck itself is a small slice of that - about 1,370 households. The volume of openers from this specific build window isn't huge, which is part of why the parts for them aren't something every supplier keeps on a shelf.