MD, this is a VERY good point that you are bringing up. HOWEVER, since at this point the groups are still small, we have no choice but to just lump everyone together. Hopefully in the future though, if we see that the group idea is popular, we will set up a system where people will join the groups based on certain criteria, such as their level of sobriety, how much penalty they want to accept on themselves - if any, etc... Then each group can choose a set of rules that they want to abide by. One group could decide "three strikes and your out", another group may decide on a different amount - whatever.
Thanks for bringing this up.