Maybe the average brasilian isn't very tall...
They dont play in the Netherlands, this time, so maybe 2 meters are enough.
My guess is that they need a "regular stage" for nice pictures on TV and on DVD
The old-fashionned high stages would have been worse picture wise.
2nd thing : the moving B-stage. They need to have a pretty sinilar heigth for both stages, and a 3-meter-high B-stage would have meant a huge empty distance between them and the audience around the B-stage.
Just my 2 cents...
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