Do you really want to risk turning away a few sailors to make things more convenient on the race committee? I say YES to online pre-registration because it makes it easier for everyone but I think onsite registration should continue to be available. Yes, it is more of a burden on the planning and management of the event but I think it's important to most events to have this option. Make it worthwhile! I think there's more room for the additional upcharge. Around here it's about an additional $5 or $10 for late registration but I would be willing to pay $15 if I had a last minute change that suddenly made me available or something.

It is not good customer service to limit available options. Good customer service is to have many different options available but at rates to make it worthwhile to the service provider.