Data Incubator is focussed on creating and publishing Linked Data, particularly where that data is converted from pre-existing sources. Its approach is to organise people around popular datasets to create mappings to RDF, write conversion code and publish the resulting data. The goal of each of these projects is to use the skill and experience of the community to develop the conversions so the original data provider can very simply adapt the work and emit the linked data themselves.
The Wisdom of Crowds (WOC) theory does not mean that people are smart in groups—they’re not. Anyone who’s seen an angry mob knows it. But crowds, presented with the right challenge and the right interface, can be wise. When it works, the crowd is wiser, in fact, than any single participant.
The Cornucopia of the Commons: How to get volunteer labor
What we see here is that increasing the value of the database by adding more information is a natural by-product of using the tool for your own benefit. No altruistic sharing motives need be present...