Why would the cable company do this?

I have coaxial cable running to several rooms in my house from when it was built. For whatever reason, they put our cable modem in the most inconvenient spot in our house such that we have shoddy WIFI coverage. I had them come out and move it to a more centralized location in the living room. When he moved it, which basically consisted of going outside and swapping the directv that was previously connected to it with the internet hookup, he went where it used to be and cut the end of that cable so I couldn’t connect anything to it. Why?

Likely related, when I asked him if he could also put a cable “drop” in my office so I could connect a cable modem to it and directly connect in there via ethernet, he said he could but that the cable company would charge me for internet twice. So I am guessing it’s because if he left it I could connect a cable modem to it as if I had two separate connections coming in my home (ie, not a single shared one)? I am assuming it’s illegal for me to buy some kind of tool to put the connector on myself?

When I purchased my modem to replace the one Time Warner had installed it wasn’t just a matter of plugging it in. It had to be activated from their end. It happened on line and quickly, but if you’ve got two modems theyve got to know about it, and they’ll charge for both.

Part of the problem here is incorrect terminology usage.
For example, you asked the cable installer for to add an outlet so you could add a second modem. He’s correct, if you add a second modem, you’d have to get another incoming internet connection and you would be charged for it. If you just want to move your modem back and forth, from one room to the next, you can do that.
You can go right ahead install your own outlet, they sell the connectors (F-Type) and the tool to do it at Home Depot.
However, it’s easier (at least IMO and IME) to run a network cable than to run a coax cable.

Two modems give two full connections - it’s not like connecting two phones to the same line.

Interesting, I see it now. I have a follow-on questions related to what approach I should take for best connectivity, but I think it falls out of the scope of this question so I am going to post another thread. Thanks everyone!

one cable in from company, one 4port router, 4 isdn cables out.
, fixed it for u.

or just go wireless.

I know I have left you guys in the dark a bit here, so I posted the real thing I wanted answered in another thread rather than my presumed solution like I did here.My apologies.

http://boards.straightdope.com/sdmb/showthread.php?t=798905

My rationale was that the more things I have connected via ethernet, the better. Rather than ME having to string ethernet through the attic from the switch on my router, I could get the cable company to give more “connection points” where I could plug in cable modems and then connect those to a switch where I could run ethernet in any room I wanted. I hope that makes sense.

Cable company needs direct connection from pole to router, no splices like old cable tv. Signal loss to much.

Need more bandwith? They might be able to throttle a bit more, at a price.