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Because there are no private sector alternatives to David Cameron's job. The wage for a public sector worker working for, say the Treasury, is high because they need to compete with the wages offered by the financial institutions. Those jobs require a similar skill set and education, so the Treasury needs to make it worthwhile for the people to choose working for them over working for, say, Goldman Sachs, or Barclays Investment.

The same goes for high level public sector workers across the board. The NHS is competing with Bupa for health care specialists, but also just for managerial jobs in general with the private sector.