Dungeons & Dragons has more name recognition of tabletop roleplaying outside of the tabletop roleplaying game hobby. Inside, Pathfinder is probably bigger, but, hey, we’re here to talk about D&D right now.
The idea behind is people who are making homebrew content (which is pretty much everyone who is running RPGs for people) can monitize the content that they’re already making. Initially, I was curious how this is at all any different than DriveThruRPG or that company’s daughter sites, but then I read an interview with WotC developers on Kotaku.
It sounds like that part of this is to maintain intellectual property control, which is important for copyright holders, without offending the fanbase that is generating the content. It also allows the publisher to get a simple and easy idea of what Dungeons & Dragons players are doing with their game, which is important for future development.
The Dungeon Masters Guild has a low cost of entry (none), which makes it different from Kickstarter, which has a vetting process for future projects. This could be a big deal for Wizards of the Coast and Dungeons & Dragons.
Despite not being a Dungeons & Dragons player, I certainly hope this works out for everyone.