Here are the links that one of the students sent re. the LAN-game breakeven analysis.  I took a quick look just to ensure that they are appropriate to post, but otherwise haven't studied them.  One is a dead link, but I have left it since it could be something that goes back up.  Note that I am merely passing these along as something that could provide additional insights.

Fen LAN Arena - http://www.fenianarena.co.uk

East Coast LAN - http://www.eastcoastlan.com

LanMines - http://www.lanmines.com

Ksunami Ohio LAN Parties - http://www.ksunami.com

Nexus Gaming LAN Multiplayer Holidays - http://www.nexusgaming.co.uk

LAN's Edge Computer Gaming Center - http://www.lansedge.com

Texas Gaming Festival - http://www.txgf.com

i-LAN Computer & Gaming - http://www.treasurei-lan.com

LanLizards Cybercafe and LAN Gaming Center - http://www.lanlizards.com