I hope your profit-sharing plans are working out for you. A lot of what has been mentioned in this thread is similar to how I run my shell. In Sept. 2007, I took over full leadership of my dynamis shell and changed from sponsorship to self-funding with 100% of profits returned to the members.
To start things out after the switch, another leader and I loaned the shell a total of 5M gil. Our first few runs went to repaying those loans while establishing a 5M gil reserve in the bank. Since then, we have made actual payouts to members totaling over 177M gil, and we currently have a cash balance in excess of 40M (reserve + unclaimed payouts + recent sales). Unclaimed payouts are eventually recycled back into the profit pool, and near the 15th of each month, we pay out all of the profit from the previous month's activities. Member shares are prorated according to total attendance for that month.
In order to make all this work, it is necessary to have accurate record-keeping. I believe that it is also important to make such records viewable by everyone in the shell, so I went through the trouble of implementing a custom website to handle all of our administrative record keeping. Attendance, accounting, and our relic armor lotting priorities (also based in part on attendance) are all fully viewable by any member who wishes to have access.
All in all, nobody gets rich with our system. There are certainly ways to generate much more gil/hr than what our profit turns out to be. But our members keep everything they've earned, not just AFv2, and they do appreciate that.
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