Just to clarify, the "top 20 by volume" figure is the disc volume, whereas the "all sales by volume" is $ volume. The top 20 by volume number is actually not all that indicative, because the majority of DVDs sold I suspect is probably not in the top 20 of sales (lots of small quantity sales of a large selection of movies). And the "all sales by $ volume" is not all that useful as well, because Blu-ray movies being more expensive than DVD, it does not actually tell us anything about the actual number of discs sold.
The 7.2m vs 500k figure for Iron Man is probably the only solid figures available for analysis, and it shows the DVD/BD at about 14:1 (or BD having 7% of sales by disc volume). Because Iron Man represented the best titles ever on Blu-ray, one can speculate that a normal title would carry considerably less % in terms of Blu-ray sales. So in actual fact, the disc volume % for total Blu-ray sales may be closer to 5% than 8%. But until Nielsen or HMM publishes the total disc volume data, one can only guess at these sort of things.
The 7.2m vs 500k figure for Iron Man is probably the only solid figures available for analysis, and it shows the DVD/BD at about 14:1 (or BD having 7% of sales by disc volume). Because Iron Man represented the best titles ever on Blu-ray, one can speculate that a normal title would carry considerably less % in terms of Blu-ray sales. So in actual fact, the disc volume % for total Blu-ray sales may be closer to 5% than 8%. But until Nielsen or HMM publishes the total disc volume data, one can only guess at these sort of things.
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