I think it'd be awesome if they don't set a cap to how many sacks you can have built up and just limit each 'mission' to once or twice per day. That way you could do all boss runs in one day if you have enough built up, and won't be err.. Unbalanced? XD...because of only being able to do each 1-5 run once /twice a day. It'd be different if it was something harder but it's been designed around the fifteen minute difficulty philosophy. I dunno, what do you guys think?