As a maintenance issue, it's not possible to remove tourneys that you or your players create that you might not want created (or where you made a mistake). Also, in my club, we have tiered tournaments where I can SAY that only [x] average or above can enter, but we get one or two folks entering saying they didn't read the description correctly.
Therefore, I believe club owners need a LOT more access to tourney maintenance - changing features of any tourneys for our CCs or deleting them before any players have played. (Wouldn't be fair after players have started playing.) And removing players from tourneys if they don't belong, leave the club during the tourney, etc.
Of course, as others said, if we had the ability to do tourneys by level/tier/avg and WGT itself would enforce that, then these after-the-fact admin tools would be less needed.
Jay