What I would like to know is the actual difference in the manufacturing cost between making, say, your $29 Ozito random orbit sander and your $159 DeWalt sander or your $229 Metabo sander.
I find it very hard to believe that higher spec wire, plastic, bearings and control circuitry can add $100 or more on the final price.
Yes, I'll allow some money for reseach and product design (assuming the cheapies are just copies of someone elses tool and not original design work, which may sometimes be the case), but the major costs - tooling, setup, assembly and shipping/distribution - would be about the same.