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exactly. Stores can hold 8 hours on a regular VHS tape with a security camera. To get broadcast quality video, they'd first have to abandon the VHS format and go with a miniDV camera, which would jack the price up and only get them 1 hour per tape.
Also, what you see on TV is lower quality than what is on the security tape, because every time you copy analog video, you reduce it's quality - just like when you make xeroxes of xeroxes - each generation brings lower quality - and the tape gets copied at least once because the store isn't gonna give the original to a TV station.
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