ok, going into the Farscape capaign (as I don’t have personal experience of any others)
There WERE those who were like “ooo just email Sci-Fi and tell them how upset you are, here’s xxxxx email address, they are the person responsible”.
Now, a simple email filter means that Day 1 they are swamped, Day 2+ they hear nothing.
Others however, were getting funds for full page ads in industry magazines, and emailing the companies who ADVERTISE on Sci-Fi to say “sorry, they cancelled my show, I’m pissed, I won’t be watching their channel and therefore, won’t see you ads. Blame Sci-Fi”. Also, emailing Sci-Fi and manufacturers of the merchandise to say “Hey, I spent $xxx on Farscape stuff last year, and you know what, Sci-Fi killed my show, no more money for you. Again, blame Sci-Fi”.
Oddly, months of emailing the heads of Sci-Fi did nothing, Sci-Fi not backing down form their statement of “It costs too much, Stargate is cheaper and watched by more people”. However the other method (in my opinion) got Sci-Fi talking to the makers of Farscape, and bagged us a mini-series. Of course, a lot will have been down to how good the head Farscape/Henson guys are at negotiating and badgering Sci-Fi to air more of the show, but am damned sure whats-his-face that makes Angel can be just as convincing.
But yes, tell the shows and the advertisers that BOOO I’ll not watch any new shows on their channel (and tell the makers of those new shows the same) or ads or in fact the channel at ALL because they killed my show.