A:
I can't speak to the gas line, but the electric cord is extra because, depending on the age of your house, and code in your part of the country, you may have either a 3 prong or a 4 prong electric outlet. Rather than include both, which would increase the cost (and be wasteful), they sell you the cord seperately, so that you can choose the right one. in any case, if they included the cord (gas line) you could rest assured that the price of the appliance would increase accordingly.