Aside from that and all the other drawbacks mentioned, it's important to realize that Voom was the pet project of Charles Dolan, chairman of Cablevision. The rest of Cablevision's board was not very happy having a cable provider own and operate a competing satellite carrier, so every attempt has been made by this board to kill off the company.
Satellite radio started off with only a tiny niche market, and yet it lasted and has mushroomed into a promising industry because there no foes in the boradroom trying to kill it off. If Voom had the support, it likely would have succeeded in time, too.
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