My publishing days were back in 1E, though I'm working on 3E updates now (next year?).
My current home campaign could be published since there are no copyright bombs; nothing in it was taken from any copyrighted source except for a small number (6 to 9) of 1E monsters, and none of them have made it into any of the dungeons I've written. The home rules are extensive (5 vols, 2k+ pages), there is much history and time lines, genealogy, lists of major NPC's, geography and maps. It would be a ton of work to clean all this up, spell check, edit, reformat, and make it look pretty for a printer. Not to mention the question of whether the world really needs another throwback 1E-ish kind of game system...
Geoff