There is a HUGE difference between grass fed, no hormone or antibiotic given beef and store bought crap.
The taste is light years ahead, you don't need all the seasonings and condiments to make it taste like beef, which is huge in my book.
I can't even eat generic beef without slathering it with rubs and spices just to flavor it up.
Not to mention, the grass fed bef cooks up in 2 minutes flat in my rocket grill and taste better than any burger I can get at a restaurant, and it's way leaner, too.
No contest here, grass fed is worth the extra $1 or so per pound by far.