In general, there are two situations that you are liable to find yourself in after the con. Too much money or too little money. There arent many treasurers who can hit break-even dead-on, and mostly youll aim to break even around the first day of the con and end up with a small profit to cover emergencies.
Sou Wester in ?? had put up their on-the-door rate in an attempt to persuade people to register early and dissuade walk-ins (since they were using the Adelphi, a hotel with security problems). Unfortunately, they were unsuccessful and got about 100 walk-ins at £60 each. Since they had already broken even, this left them with vastly more money than they knew what to do with