But how about in skill at fan manipulation by a show with a comparatively small fan base?
I still think Buffy wins. I mean, we had Joss and Tim posting here. Way to go to work a crowd. They had the Bronze as official, and I think Tim posted at TWOP as well, and who knows where else.
And Joss is a master (no pun intended) at whipping fans into a frenzy, although his shows didn't really have numbers to compete with the big boys, they did manage to get a lot of undying devotion following from project to project.
I don't know if appearing on Supernatural ever made anyone more castable. It's a remarkably low profile show and we fans don't count for much in terms of desirable demographics. Ads on it are the cheapest on the CW, although its ratings are decent for that network. But I don't think that appearing on it gets you more eyes, and even if it does, they're not the sort of eyes that fill movie theatre seats or activate Nielsen boxes. The two leads are barely B list movie actors. They barely have any recognition outside people who watch the show, as opposed to word of mouth or paparazzi draw.
Which is all a damned shame, and I'm glad cons pay so much, because I don't think appearing on the show pads their bank accounts much any other way. Misha was on the show for how long, and now he's on Ringer? Yikes.