The reason is 2D and 3D will cost money (likely to be a fairly substantial cost) to produce and its unlikely that the other version will have a big enough effect on winx popularity to justify the cost. So if its unlikely that they will recoup the benefit through sales of DVDs, dolls, comics etc. They won't do it.
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*stella* created this wonderful avatar and SpiderBraids for the rescue and Angel Darkstorm this wonderful signature
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