dead said:
If you have a DM who starts new campaigns all the time because he/she gets "bored" of the current campaign how do you stop him/her?
As a DM, I would like to attempt to speak to this from a different angle. In the late 80's-early 90's, I had a campaign last almost 6 years. My first 3E campaign lasted for over a year, but ended when several players moved. Also, as players and I learned the new system, it became clear that the campaign needed to change. So, we changed to the next campaign, which lasted about a year and a half. We left it because the players wanted to.
The next campaign we started only lasted a few months for two reasons. First, we had some player conflicts, then the deaths of some core PC's took away the party's raison d'etre. Then, we switched over to D20 Modern, which ended because some players wanted episodic unrelated sessions, for which I ran out of ideas, and some wanted a story driven campaign, which the other players did not want. Also, I wanted to return to fantasy.
After that, we attempted Midnight, which some of our players hated and some loved. Then, we tried another campaign that everyone agreed was going nowhere. Recently, we started our most recent campaign, which is currently on hiatus due to player conflict and a DM decision. It seemed that what the players wanted from the game was not what I wanted. There also seemed to be some generational problems.
So, there are a number of reasons why I myself have run several short-lived campaigns in a row. Do I want to run a long term campaign? Of course. I just want it to be the best it can be. I want to run something that will make everyone at the table happy, including myself.
I have a player who DM's for other groups who also switches campaigns frequently. I am not sure of his motivations for doing so, but I know that it does aggravate his players, as I am sure it has done to some of mine as well.
DM