Raise tax rates and revenues drop....
Up to a certain point only. There is a rate at which revenues peak.
1% of this population pay up to 30% of the total income tax take.
Do you have the figures at Shoreham to show that revenues are now lower with the current landing fees? Do you have a proposal for how much they should be instead, and how you work that out?
I am not particularly trying to defend Shoreham with its tired facilities, narrow runway and no ILS (I used to fly a PA-23 from there, and haven't for a while but that has nothing to do with landing fees), but their fees are in line with say Biggin Hill. If the landing fee really means that much to you, then don't visit the airfield. Maybe without your business they will drop the rates to have you return. I can certainly recall that if I wanted to practice circuits or approaches I went to Lydd (very cheap, but the procedure there is ridiculous) or to Calais (so you can get the excise duty drawback).