Transtraxman makes a very good point about journey cost being terminal to terminal. Here on the south coast some 50 miles to the west of Brighton friends of my parents once made the mistake of thinking they were getting a good deal by saving £20.00 on a flight to AGP by flying from STN rather than LGW. Result was a £260 taxi ride as opposed to a £85.
Personally I have no desire to travel Ryanair or Easyjet and avoid Flybe as well. But as I said before if the BoB is to upgrade your catering option from drinks and a biscuit to a sandwich thats fine.