WHY cable modems?

inquiring

Distinguished
Jan 7, 2002
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Why do my local electronics retailers advertise/sell cable modems when the local cable ISP’s WONT allow their use and insist on providing/selling their own cable modem to the end user? What am I missing here?
 
are you sure there's only one ISP around this shop ??
I don;t really see why you ISP would prevent you from using your own Modem though...

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