Studebaker - Packard is the case they always bring up im economics 101: two weaknesses do not equal a strength.
QVC and HSN have similar weaknesses :
1) they both depend on people with cable who don't watch Netflix or Hulu or have a DVR
2) they both depend on people who like buying mail-order but hate shopping online
The demographic for both is "old people". However, people getting older these days can figure out amazon. Shit, my 78 year old dad is a big fan of Woot. Which means HSN and QVC are reliant on old, stupid people.
And they are dying out.