The business model for wikipedia is perfect for them. The service, an encyclopedia written my common people, for common people, is an extraordinary achievement in the history of man. By taking donations to run the servers, it keeps the image of being a public resource relevant. Nothing is more valuable than knowledge to the people.
Wikipedia's model tends to veer from refinement and perfection and toward a more fluid cache of interesting information it is better to verify with other sources, preferably those ending in .edu. The idea and ideals initially seemed plausible but the editing by many function of the model seems to have taken on a darker turn when the ease of editing changes content into a collection of misinformation and lies.