Actually, I guess I'm special then...
I build HomeBrew only, but use anything that isn't nailed down, dead, or fighting back to hard to hold onto.
So far, for the game I'm running, Were using "Four Color to Fantasy: Superhero Toolkit", "Requiem of the Gods", "Tournaments, Fairs & Taverns", and even the new "The Elements of Magic". This just names a few, but the funny thing is: nothing clashes!
I also use modules from differing places and fix them in the world with little more than a slight rewrite to make them 'special'.
Of course I make custom parts too, but only where the wheel has not been invented yet. I mean, why build a mega dungeion when Descent Undermountain or Dragon Mountain already exist. Just flesh them out, put in the storyline you have been working toward, and let the players tear apart THEIR work.
Not only do the players get fresh material constantly, but I don't burn myself out!
Remember, gamemastering is supposed to be FUN!
Mr. Oberon
"No, Really! I'm only using the MAP from the Temple of Elemental Evil! Don't leave!"