I've wondered that too, asked a few people, nobody can ever give me a straight answer  alot steiners get slaughtered in green bay.    figured that they were mostly hamburger, but a friend of mine has been going straight to the packer, and 60-70% have been hitting prime/choice.doesn't make sense that they would be grinding them for burger.    we have been eating and selling stein and crossbreds for a good number of years.  I have had customers that prefer steins, and customers that prefer crossbreds.  I myself prefer a well finished stein over a crossbred.  if you don't push the energy to the steins, marbling can be a little scarce.