Nothing like ranked servers, where admins have to pay extra. However, perhaps an option where admins can have stats reported to the master server - i.e. weapons stats, kills, etc. I believe Epic did this for UT2k4 and it allowed them to monitor if one weapon, power-up, etc was dominating too much of the playfield and they could adjust accordingly via patches.
This would be perfect for an open-beta and or open-beta/demo. That way people could play for awhile and you could gather stats on game balance, introduce streaming patches, etc.
When the open-beta is over, simply make it so the open-beta can’t report to the master server so people have to purchase retail, etc.
Secondly, I suggest if patches come out, please have the game auto-detect them and downoad them.
Just a thought.