We paid, not much extra, took porch down after two days as too windy and didn't dream of asking for a refund (!) and had a great break. Just wondered why!
As I said circular argument. One could equally ask why should a small tent pay as much as a large caravan/awning/dog/etc? Anyway, thread success because you now know why & of course you should have asked for a refund on the days your awning was not erected. It works both ways.
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If they say they charge more for an awning I look for other sites. Lots of great ones which just charge a one off fee. Do the same for the dogs if we can as well.