Knowing how few DTS DVDs exist relative to the total number of DVD discs out there, I'm wondering what prevents Dolby from introducing a discrete 6.1 channel DD format? Knowing what the move from say an older DD 5.1 only decoder to a new all-format 6.1/7.1 decoder costs, I can't help but wonder exactly how many movies I'll want to see out of the small number of DTS encoded ones that exist. Put it this way; If I watch 100 movies this year, most will be in DD, so the "cost per movie" is relatively low when you factor in the decoder cost. But the "cost" to listen to DTS-encoded movies is going to be high when you factor in the decoder cost. If you only watch a couple dozen DTS-encoded movies a year, then they technically cost far more (each) than listening to DD movies.