Just because
- the next demo is always soon: simply it is this or the next week - no time to be wasted
- the story set selected for the sprint is never too long and - can be kept comprehensible
- the demos held often enough keeping - the stakeholders are interested and willing to spent 1-2 hours each second week
- ScrumMaster is stressed enough to become a better ScrumMaster :)
The whole issue in PDF can be downloaded from here.