What I noticed was that there will be leakers, but reducing the sheer number of people in the group can reduce this chance.
With high buy-in (ie. 10 sojs) we only need 12 ppl in a group. And as long as we don't leak, we can get at least 3 games per person (ask friends, etc.)
Curious if anyone would be interested in this.. but obviously it needs trust at least within the group of 12...
Pm me if you're interested and I'll try to gather a group that is actually trustworthy