A lot.  They are the best at what they do.  Look at what Apple does with their products.  How many different ways they can bundle the same iOS on various devices?  iPhone, iPad, iWatch.  All essentially the same thing and there is nothing wrong with that.<p>Dyson&#x27;s business model is making products with amazing suction or airflow.  Whether it be vacuums, hair dryers, air purifiers, fans, etc.  Their robotic vacuum hasn&#x27;t even launched in the US yet. <a href="https:&#x2F;&#x2F;www.dyson360eye.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.dyson360eye.com&#x2F;</a><p>The reason you haven&#x27;t seen cheap knockoffs is probably because they have patented their tech and a cheap knockoff isn&#x27;t possible.