This is very cool, just two quick questions..
Why 6 and not 8? Seems like 2 of my buddies are getting screwed when max party size is 4. I'm guessing it partly has to do with the rate of earning coins, it just seems slightly odd.
Do you have to be currently online to get credit for each other's play time/activities?
i.e. I can be offline while my buddy is playing and as long as he's in my alliance I'll still get alliance points for the week.
If so this sounds great because I have buddies across all of the US time zones, so being able to contribute even if not able to do a full coordinated group run is always a positive.
You do not have to play with them, so we aren't bound by multiples of group size. And yes, we are tracking whenever anyone plays for this system. So you can be offline and we will still track your friend's earned XP while they are playing.