Speaker manufacturers or box manufacturers with off the shelf drivers?

This is nothing new, it has existed for decades.  There are several good makers of speakers that make their own drivers and those that build boxes and put ScanSpeak or some other "purchased" drivers in their boxes.  

This is not ment to be demeaning or a put down, it is more of a question.  With so many speaker "builders" using off the shelf drivers...is this simply a "high-end" version of Radio Shack or are these legit high-end products? 

 I do not know if other manufactures sell their drive units to box manufacturers....