Regarding the jackpots - 3 players rule has one important exception. If they queue, match together and sit all 3 on same table, they will not be able to play next game again. It is for fraud protection purpose. If they play one game together, next time they will be queue-ed separately. Therefore more players will need to be registered. Otherwise they will wait for new player to play with.
Please let us know if this is clear. We are also monitoring to see if this can be improved.