Our guild is slightly inactive and while all log on each day a bit too many ignore crypt or take just 1 skull. While a 10 skull limit works about 5 days out of 7 it's annoying to log in and take away the limit 7:30am on a Saturday morning if too many are slacking.
The jump from 10 to 20 and then unlimited is a bit much and would really appreciate a limit of 15. If you don't want more options to choose from you might as well take away 1 and 2 skulls and switch them for 12 and 15. I can't imagine too many using those limits?