Sure. Of course Homlett is Greyhawk, isn't it? I luckily got a VGC monochrome copy as part of a lot a few years back that essentially cost me nothing.That seems to be one dominant view these days. And all of us DMs have stolen liberally from other sources or borrowed from adventures for our own campaigns. If 5e really is meant to be an Everyman's D&D I could see them turning the clock waaay back to the Hommlet model, where the modules become discrete settings (with maps, etc) that individual DMs can connect however they like. It would make sense since supposedly they're wanting a more adventure-focused product release. We'll see what happens.
I have a strange fascination with modules and settings. I find them inspiring and boring all at once.
I have around 20-30 them, plus a Ruins of Undermountain set, and have never run any of it. I can't say I've cannibalized much, either. Yet I love reading the stuff. I love seeing how different people design adventures, and of course, there's often great artwork.
But when I sit down to write, it's all me. And I find my preference for source material is not RPG books.
since people are mentioning Krynn, I will chime in: loved those first 6 books, have never owned or read a Krynn module, but one thing I like in the 1E sourcebook are the effects of the three moons. MU's in Krynn are basically 3 sub-classes , or proto speciality mages.
also like that Tiamat was rightfully made a greater Goddess in Krynn mythology...