Gotta agree
I've had the "If I don't own it, you can't use it" rule in my games for a long time (including earlier editions). It's not that I don't trust my players, but... I don't trust my players
Well, to clarify, I've had too many players (intentionally or not) misread something from a book I didn't own, making their characters significantly more powerful than they should have been. Plus, a lot of books are balanced by the other things in the same book (ie, you generally only find psionic monsters in the psionic book; Draconomicon, I believe, had both dragon stuff and anti-dragon stuff), and if I don't have access to the book (generally by owning it), I don't feel I can adequately supply challenges for character's concept without causing the rest of the party undue problems.
That said, I've always told my players they're free to buy me such books
And to show the flip side, just because I own a book doesn't mean everything in the book will be allowed. In my opinion, all the rulebooks are possible ingredients, but I only choose a limited number (even if that number is large) for each campaign recipe.
CRGreathouse said:I'm with Davelozzi here. While I *might* vet a class or two from a player's book, I'm loathe to allow much -- if anything -- from books I don't have, since I need time to think and look things over.
I've had the "If I don't own it, you can't use it" rule in my games for a long time (including earlier editions). It's not that I don't trust my players, but... I don't trust my players

Well, to clarify, I've had too many players (intentionally or not) misread something from a book I didn't own, making their characters significantly more powerful than they should have been. Plus, a lot of books are balanced by the other things in the same book (ie, you generally only find psionic monsters in the psionic book; Draconomicon, I believe, had both dragon stuff and anti-dragon stuff), and if I don't have access to the book (generally by owning it), I don't feel I can adequately supply challenges for character's concept without causing the rest of the party undue problems.
That said, I've always told my players they're free to buy me such books

And to show the flip side, just because I own a book doesn't mean everything in the book will be allowed. In my opinion, all the rulebooks are possible ingredients, but I only choose a limited number (even if that number is large) for each campaign recipe.