Yes, certainly spamming in all forms work. It generally makes people very annoyed, which is just about the opposite of the desired effect.
Funny anecdote; look what it did for Star Trek, indeed. Finnish MTV3 (or MTV back then) decided to quit showing ST:TNG after the third season. Snail mail spamming ensued, angry fans even dug up the home phone number of the unfortunate dude who was responsible for those decisions. Death threats at night. All kinds of nice stuff like that.
Result? The dude vowed never to buy any sci-fi, much less Star Trek. And lo and behold; there was no sci-fi at MTV for several years after that, and to this day they have remained extremely reserved towards sci-fi series, X-Files and Millennium being just about as far as they are willing to go.
So I would suggest thinking carefully about methods that you are willing to use, some of them might do the exact opposite of what you are trying to accomplish.