Because the DVD release will be much better, multiple cameras, better video quality, the complete show, 5.1 surround sound and offcourse the extras. Enough reasons?
The cover presentation is top notch. But don't judge this by its cover!!!
It's bound to be an awful video of the concert with several head and hands in the way (unless it was filmed from the balcony in which case that would be a unique viewpoint!!!)