A think a big problem for no-statblock modules is that you're competing with everything else that has ever been published! Eg I have a lot of great Necromancer Games 3e material that I can convert to 4e as easily as I could take a generic product and convert it to 4e.
I would suggest sticking with 4e, but include single-line statblocks compatible with OD&D/AD&D/retro-clones, eg "Orc AC 6/14 hd 1 hp 5 ATT +1/THAC0 19 dam 1d8". You can't do this with 3e as the stat blocks are too large, and I would not recommend having 3e/Pathfinder and 4e blocks in the same printed product. I would suggest alternative printings for both, but print one and free download for the other might work.
But the main thing is, pay attention to quality. I've bought lots of DCCs because they're cheap and have fun ideas, but too often I've been let down in play by boring maps and a lack of meaningful descriptive text. My biggest disappointment was 3e Dreaming Caverns of the Duergar - after the umpteenth boring-cavern-with-1-Duergar, my players rebelled and refused to play further! I suggest making it compulsory on authors that they include a brief para of boxed text in each location that properly describes what the players see.
I would suggest sticking with 4e, but include single-line statblocks compatible with OD&D/AD&D/retro-clones, eg "Orc AC 6/14 hd 1 hp 5 ATT +1/THAC0 19 dam 1d8". You can't do this with 3e as the stat blocks are too large, and I would not recommend having 3e/Pathfinder and 4e blocks in the same printed product. I would suggest alternative printings for both, but print one and free download for the other might work.
But the main thing is, pay attention to quality. I've bought lots of DCCs because they're cheap and have fun ideas, but too often I've been let down in play by boring maps and a lack of meaningful descriptive text. My biggest disappointment was 3e Dreaming Caverns of the Duergar - after the umpteenth boring-cavern-with-1-Duergar, my players rebelled and refused to play further! I suggest making it compulsory on authors that they include a brief para of boxed text in each location that properly describes what the players see.