Pollen collection is beneficial for a couple reasons:
One: you can harvest pollen when pollen heavy flowers are blooming, then feed it back to the bees when they need it (in times of dearth or to boost brood production). Pollen contains protein bees need to raise brood.
Two: pollen has become a popular super food and can catch a premium price at the market. Pollen is high in enzymes and protein and is a mainstay in health food stores. People add it to smoothies, sprinkle it over oatmeal or just eat a pinch straight!
Wait, but what is pollen?
Pollen is the male germ cells produced by all flowering plants for fertilization and plant embryo formation. Flower pollen collects on the legs and bodies of worker bees. Sometimes it can also include nectar and bee saliva. Pollen comes from many plants, so the contents of bee pollen can vary significantly depending on the region where collection took place.