What would be the benefit of being a producer in terms of energy?

As far as energy goes producers have it easy. Their energy comes from common left over materials such as water, carbon dioxide, minerals, and sunlight. Everyday things that come naturally. They barely have to even work to get energy. 

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The Light Reactions of Photosynthesis[edit] The light reactions occur primarily in the thylakoid membrane of the chloroplast. ... The high concentration of hydrogen ions pumped into the inner thylakoid space (the thylakoid lumen) can then be used to make ATP by a process called chemiosmosis.