- You loose all your contribution. If you come back to the same group, you don't recover your contribution
- However the contribution that went to group funds isn't lost, so group can still use it.
- When you leave, you loose all your group skills. If you join a new group, you'll recover it (refresh the game when you join) IF the group has enought group skills lvl.
- When you join a new group your contribution will always be 0, no matter you had before.
- After lvl 30, you won't be able to participe in war for 7 days.
- After lvl 40, you need to wait 8 hours before joining another group.

So yes, spend as much as you can before leaving the group you are in.