Aeric
Explorer
In D&D, as opposed to most other games/systems, there is so much "stuff" to play with. Five books with nothing but monsters, and that's only counting WotC-published material! All of the Complete books, the "Races of..." books, a book for arctic adventures, a book for oceanic adventures, etc.
D&D is the best-supported RPG on the market, meaning more options as a player and less work to come up with my own stuff as a DM. Not that coming up with my own stuff is a chore, mind you--after all, that's what playing an RPG is all about. But it's nice knowing that rules exist for almost anything I can think of, and if they don't, something similar enough does so that I can use it as reference.
For someone who isn't the most rules-savvy when it comes to inventing my own monsters, races, classes, etc., it makes for a nice safety net.
D&D is the best-supported RPG on the market, meaning more options as a player and less work to come up with my own stuff as a DM. Not that coming up with my own stuff is a chore, mind you--after all, that's what playing an RPG is all about. But it's nice knowing that rules exist for almost anything I can think of, and if they don't, something similar enough does so that I can use it as reference.
For someone who isn't the most rules-savvy when it comes to inventing my own monsters, races, classes, etc., it makes for a nice safety net.