Well, I always buy Hebrew National hot dogs because they are kosher and I can count on the fact they don't have "byproducts" in them because they are certified kosher.
Yes, they are more expensive, but I'm willing to pay the extra if it means I'm not getting beef lips or beef ears in my hot dogs.
Many observant Jews are mostly vegetarian, probably because of the expensive kosher meat prices. They are more apt to eat dairy, fish and eggs for their protein, since there are not so many restrictions on these foods.
There's something to be said for requiring the butcher have respect for the animal's life, and to do the deed as humanely as possible. There's a lot to be said for that attitude, in fact.