Why are groceries SO expensive?

I just returned from yet another depressing trip to the grocery store. I am in weekly shock of the final cost when the cashier presents me with my bill. I am a huge coupon nerd and follow the weekly circulars like a hawk, yet I just can't seem to get ahead at the grocery store. I can't be alone...and although I am not a psychotic coupon-er like those on TLC...no one is waging a war on the grocery stores. Anyone wish to start one? If I were brave I may, but I am just little old me and only have the power to complain. :-/ Woe is my wallet! Thank you brand named foods and ridiculously priced produce for making my evening so splendid.