Even with a small active guild 10 guild missions is too low lol.
While we're at it, let one-man guilds run missions.. let's not pretend a significant portion of the player base in this "MMO" isn't solo. It's punishment enough to just have to do guild content by oneself, it shouldn't be completely locked off and the necessary buffs forever unobtainable unless you disband your own guild (which may have offline friends you hope return someday) and join a bunch of people you don't like.
Maybe not 100, but it sure really needs to be increased. Even 10 more, so 20 daily would be a huge difference.