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The networks (with rare exceptions) have nothing to do with whether a particular show gets released on DVD. The studios , not the networks, produce and own the shows that are released through their home video divisions.
The TV networks license (i.e. pay for) the shows from the studios for broadcast. Sometimes the networks have co-ownership in a particular show, which can complicate matters. The networks usually help finance the development of a show they'd desire, while the studios also produce "pilots" that are "shopped" to the networks. Many shows have switched networks during their original run, whether because of contract disputes ($) or canceled by one then picked up by another.
That's the short answer. There are too many other reasons why a show is released on DVD or not, and they are discussed here ad nauseum.
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