Jeepers what is it with you guys. Amsterdam. Heathrow, Frankfurt are not GA Airfields!! Their cost levels are not the same as the airfield that mows the grass a couple of times a month and isn't so busy that it needs a slot system.
You are flying into busy commercial airports that have to provide a very costly infrastructure, and maintain a very costly infrastructure. The MD of EDI was being a tad devious in trying to blame the GHA, as the GHA is no doubt paying an exhorbitant fee to the airport for the privilege of being there!
These are businesses not charities, and they have to generate money for the business. Your Cherokee or Cirrus is not going to make a ha'porth of difference in the grand scheme. I love the idea that it is thought that by taking in one passenger every blue moon you are providing a hub operation!
Direct your ire towards the airfield grabbing developers and local councils who are closing airfields that DO want your business, such as Wellesbourne and Old Sarum and many others. More support for these might have made a difference to their survival, but one passenger in and empty out is not wanted at LHR or FRA where that movement could be an A380 with 500 in and 500 out, or even Liverpool where it could be an A320 with 155 in and 155 out.