It seems like this is now possible: Just recently Game Crafter, a site for board game creators has been launched.
It is time you took that game you created and publish it. No more homemade board or cards. You have arrived. Now, publish it!
…they’ve announced proudly.
Indeed everything you need to make or re-make your game is online. Just put together the pieces, upload your own stuff if you want. That’s all. Then you are ready to publish your game and… sell it. Yes, sell it, online.
Raph Koster puts it best: Now we have Cafepress for board games :)