I hadn't considered a coupled motor / gearbox option. I stand corrected.
I agree. The motor/gearbox assembly I have for sale is commercial/industrial. Highest quality and virtually indestructible. I actually got good ebay deals on those items.
You might not be able to justify that setup for home brewing but I certainly have no problem with it. I suspect I'm not alone. But, to each his own. Many home brewers gradually move to bigger and bigger operations. This kind of mill equipment will certainly follow those operational expansions.
I'm of the position that I buy once and expect it to last a lifetime, or even two. In my younger days, on occasion, I bought cheap and found that in the long run, I would almost always be buying a second time. As a rule, I just don't buy low quality/cheap tools or equipment. It's not worth the cost and trouble to replace.