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Crap - a tire-company for example doesn't need zillions of testers too, if you're using some quality software engineering you do have certain means to test quality and reliability. On the other hand, who with a sane mind would like to be an tester for tires, so to say and early adopter? As I said, no one with a sane mind. So a big community as mark for quality or development is just nonsense.
My father works for Michelin Tire, and Tire companies do have testers - thier employees. They get very high discounts on tires from Michelin, 85-90% and they have to return the tires to michelin after thier useful life. Michelin evaluates the wear on the tire, and uses that as part of it's quality control system. That is a very large community. Many eyes find many problems, whatever the product.