Orius
Unrepentant DM Supremacist
hong said:1) As you say, the more reading material there is, the more likely that it's going to be thought of as work. I know I certainly would be pushed to read 100 pages of material, and furthermore, I'm likely to resent a DM who expects me to do it. Now to some extent, as a DM you have a right to expect players to show some commitment to your campaign, and there are some clueless players out there who just couldn't give a damn. But even for reasonable players there's a limit, and usually that limit is reached when they start thinking of the prep stuff as a chore.
And along this line of thought, the DM needs to let the players know enough about a campaign so they can make the characters fit, but not give them too much information.
It also depends on how long the DM and players have been playing the same game. If it's a completely original homebrew that's been fermenting for about 10 years, then 100+ pages isn't going to be needed by anyone, except maybe the occasional new guy. They already know this stuff. But in the example that sparked this thread, we got a DM who's using a pre-prepared campaign that not all the players know everything about. He's got a lot of material, and I'm sure he wants to use it, but he can't dump too much on the players at once either if they're not familiar with it.
2) The more details you fill in about your campaign world, without any participation by the players, the greater risk you run of reifying the world -- of treating it as important _in its own right_, rather than as a setting and stage for the game. Again, to some extent, you have a right to do this: it's your world, it's your baby. However, rare is the player who's going to feel such a degree of attachment to something they didn't have any part in creating. What's more, by filling in all the details in isolation, you run the risk of blindsiding yourself to things that the players might actually do. This risk just becomes more likely as the power level of the campaign increases, and the players find themselves being more able to act as autonomous agents.
And too add to this, as an inherently lazy DM, I don't mind if the players help to fill in some of the blanks either. There's only so much I can come up with on my own, and if they come up with something good, I may just find a way of adding to it.