It doesn't matter what I think; the NFPA NEC code dictates what is required and the local electrical inspector has the authority to enforce it. He is called the AHJ, Authority Having Jurisdiction.
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The authority having jurisdiction (AHJ) is that person or office charged with enforcing the Life Safety Code. In many states the AHJ is the state fire marshal who has local inspectors work on his/her behalf.
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https://www.google.com/?gws_rd=ssl#q...g+jurisdiction
https://www.google.com/?gws_rd=ssl#q...lectrical+code
Some satellite companies do something like your way, called piggy-backing, but it does not comply with the code.
http://www.dbsinstall.com/diy/Grounding-2.asp
Todd Humphrey doesn't speak for the NFPA that publishes the NEC code, but he has some ideas that are helpful. The local electrical inspector has the final say if you are willing to get him involved. Some inspectors are more friendly than others; a local electrician could tell you.
As far as I'm concerned, I ground the coax with a grounding block for personal electrical safety because I have had three close calls with electrical shock. The coax is connected to AC operated equipment, and all AC operated equipment has AC leakage current even when it is operating properly. Example here:
http://www.digitalhome.ca/forum/81-o...ml#post1457594
http://www.digitalhome.ca/forum/81-o...ml#post1457668
Some surge suppressor strips have coax grounding jacks, but I don't think it is a good idea to use them. They do ground the coax shield if the strip is connected to a good 3-wire outlet, but the strips often have a surge protection device that is connected between the center conductor and ground that can degrade the TV signal. Also, the center conductor can pick up electrical interference from the AC lines in the strip.