True for real "hot boxes".
But I know for a fact that there are techs here in Baltimore that are selling boxes with all the channels on them for about $200-300.
I'm pretty sure what they are doing though is just putting codes on a box that is attached to another persons account.
What cable system, and have they converted completely to digital? If they are digital the box will eventually be found out.
Comcast is converting all of their areas to 100% digital, with only local channels still served analog, and even that will end eventually. When they finish converting a area they then go through and audit the accounts and turn off the boxes that don't match up.
I had a box that never had the HD package enabled on it, when I moved for some reason the tech didn't carry it over but it was never turned off on the box. A year after the conversion I got a letter saying they saw I had channels I wasn't paying for, and if I didn't call to say I wanted them they would be removed. The same letter went to several other people I know that had similar boxes.

.....and my black box would still be working...miss that shit,use to watch every PPV fight