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I don't know how credible celebrity net worth is, but Wikipedia can't provide the best estimates. It doesn't have the organizational structure to ensure that they're present for all celebrities, or that they stay up to date, and its policy on citations means it can't engage in well informed speculation.

The best Wikipedia could do is (manually or automatically) scrape a site like celebrity net worth for information, linking to its estimates, if wikipedia editors decided that it was a notable/reputable source.