I figure there was an economic component to their relationship with Orcs/Sauron. Sauron did not like them and wanted to dispossess them of the Seven due to Dwarven nature, but he could work with those he hated. He hated the Númenóreans for humbling him, but he did not mind having them as servants. I do not know what Sauron promised the Dwarves.
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"For believe me: the secret for harvesting from existence the greatest fruitfulness and the greatest enjoyment is - to live dangerously!" - G.S.; F. Nietzsche
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