I would agree with Gyrbo that only Belgium is necessary, and the neighboring regions nice to have. Outside of Europe there is little name:nl tagging anyway:
http://taginfo.openstreetmap.org/keys/name%3Anl#map The cost estimate of a worldwide server is only to have an idea as to what kind of sponsering would be required. I'm thinking of setting up a list of things-we-would-do-if-you-give-us-your-money, and this could be one item. That said, wasn't the wikimedia server stack going to solve this problem?
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