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Yep it is easier I agree, but my own reasons for wanting to do it are as above, plus we can use it as a garden heater on chilly evenings. Also I had massive heart failure 3 years ago and only a quarter of my heart works now. One of the things guaranteed to flake me out is heat, I hate it! Last Sunday it was so hot in the kitchen I was quite unwell, hence the decision to cook outside, thus negating the need to have the oven on. Plus as someone mentioned gas prices are set to rise by 46%, and fire wood is a by-product of my husband's job.
We might get fed up with it, but we can fill it in and grass it over again if we choose later or have a water feature in the hole :-)