Epic's Brandon "GreenMarine" Reinhart updated his .plan with word on why server operators running the Unreal Tournament Demo should not set the player limit higher than 32, at least using the current release. Here's the poop:

I saw a CTF server running with a 50 playerlimit. Running servers with more than 32 players is a no-no because there are hardcoded assumptions about the max playerlimit. Maybe I'll talk with Steve about increasing it to 64. (I guess there isn't really any reason to choose programmer numbers like 32 and 64 for something like this.) I seem to recall at one point there being a very good reason for us keeping it at 32. Certainly server performance would be...ah...highly questionable at 64 players :) Anyway, running with more than 32 in the current demo will probably cause a lot of odd error messages to get logged when the 33rd person joins.