The costs of monoculture are much higher than a few thousand stolen hives.  Sustaining bee populations on a steady diet of almond pollen weakens their immune system to the point where they cannot fight off diseases caused by invasive mite populations.  Just as a steady diet of hamburgers would weaken our immunity for fighting disease.  "Get rich quick" almond farmers must understand that planting hedgerows of various perennial flowers between their valuable almond trees introduces variation into the diet which keeps the pollinators strong.