Kemble is a great location and has great facilities but as others have said, it is the hike in landing fees that have put most people off. A rise from £8 to £10 might have been easier to swallow bit to £14 was a hell of a jump.
In the global scheme of things it is not a lot of money but to a lot of pilots it is and they vote with there feet.
Even the management needed to raise the fees then perhaps doing it over a bit longe term in smaller chunks might work better.
As flyboy says pilots are indeed a fickle bunch!