I think it would be rather beneficial for those of us who like to be behind the DM's Screen and run more than 5 games to have well... more than 5 games as an option to share our compendium out to. I know that you can swap and rotate games in between sessions, but I have found that to be sort of clunky to say the least. Especially if there was a level up in that session and people want to level up throughout the week but don't have access to the charactermancer they were using before because the game is swapped out. This seems like a very reasonable thing for the Pro tier subscription. (Though I could also understand if a higher tier would be needed, as unlike the books being available at your table for your players to use, the books are available 24/7 to the players). Furthermore- Being able to omit chapters or sections of the digital books would be amazing. I love owning several creature books, tomes, manuals and codices that have cool player character options but could also allow for some metagaming. Or perhaps you like some subclass options available but don't want to have all of the spells dragged in (EGtW comes to mind). That seems a bit too in-depth but worth bringing up nonetheless.