Quote from Cool Matty:
It was never intended to be a method of stopping cancellations in general. We couldn't, and wouldn't do that. That's why we offer refunds. This is just about keeping accurate tally of what runners are on-site on which specific days, and being fair to other runners who might have had a chance in your place. We wish we could stop cancellations, but honestly the biggest problem is just not being notified. It's unfair to everyone involved if you no-show to the event, or cancel a week before when you've known for months you couldn't go. Can we stop it from happening? No, but we can encourage people to do the right thing. If you have to cancel, do it right, so it can be taken care of.
I'm assuming this would also mean you don't have to hope gdq got your message? I know someone who got no response when they asked to drop long before the event.