Ok, let's compare this system with simular system from Lord of the Rings Online:
1)In Lotro, you get +25% bonus tokens from any raid or instance in Instance Finder System. And it have CD. Not 1 week, just 20 or 30 minutes.
2)In Lotro, you can choice between random instance/raid or choice specific instance/raid.
3)And you can't start instance/raid until every member of raid choice his role (dd, tank, healer) and complete afk check.