Yes, if you can afford it.
its really not all that expensive really, you only start really feeling it in your pockets when you are buying anything thats coming from an animal (meats, cheeses, ect.) Produce isn't THAT much of a difference, and if you are copping at markets its prolly cheaper than going to a chain.
Either way its still better than eating Bk everyday.
I say learn how to cook with regular grocery store stuff, then once you good you can move up to the more organic or premium foods. But don't get caught up in all that "free range" BS, a chicken being happy or not ain't that big of a deal. I go to Whole Foods (or Westborn Market) for produce, juice, cheese and if i have the bread to visit the butcher. Which IS a big difference in the quality and cut of meat, steak out the plastic is failure food after some premium cuts from the man swinging the cleaver.