SCUM
If you're gonna advertise a prize, I think it would be best to do it at the beginning. I would have actually played the map instead of letting it die. Besides, more people would donate in order to win it...
That would be the normal process going forward. I decided on a prize for the next funded world, but I thought the people who have put time, effort, and money into the first one also deserved a reward.
So, in this case, it's a surprise reward for the current players. In the future, it will be announced when the world is created.