It's not about what they repair the most, it's about their knowledge, experience, and expertise in a niche. Even if they repair cheap household crap frequently, they may also make repairs on industrial equipment that's been in use for decades. They'd understand the differences between various products and companies, differences that a layperson wouldn't have experience with. They may not be analysts, but they'll know which models have expensive parts you'd need to ship from overseas, vs which models could be repaired with a trip to your local hardware store. That's the information that makes them a valuable resource.
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