no person should be using more then 10 at any one time anyways.
people need to learn to disable the ones they dont need for today's server.
The only exception I can think of is extra bricks, events, or tools.
But as for weapons/vehicles/gamemodes, yeah you shouldn't need everything you can get your hands on. You do not need 30 vehicles, hell you can't even spawn that many. You do not need 50 weapons, you can only carry 5. You only ever need 1 frikken gamemode. The only exception is having TDM and another gamemode that runs off of it. You can only use one at a time. I don't see how you can incorperate people becoming zombies, while capturing a flag, putting out fires... all of this on a racetrack.