FRatSTN - thanks for your considered reply, although you do seem to be making a great deal about EZY charging different prices for different days. Personally I have never seen this as an issue, just a pure case of supply and demand.
I cannot however agree with your comment that FR make it 'pefectly clear' if they are not flying to the main airport of a city. Beauvais or Weeze for example - if I want to fly to Paris or Dusseldorf I would expect to land somewhat closer to the city than these two airports.