Does Amazon copy or undercut successfull products? A few years ago I bought some high quality monitor arms; heavy duty cast aluminum, etc. for about $150 each.

Does Amazon copy or undercut successfull products? A few years ago I bought some high quality monitor arms; heavy duty cast aluminum, etc. for about $150 each. A couple years later I go to buy another, and now there is an Amazon branded clone for $100. The only difference is black painted vs. the original polished aluminum.