Sounds like a Biggin Hill type airport. There you're paying c. £20+VAT to land or £50+VAT for an instrument approach. That's too expensive for GA really
In fact the £20 landing fee includes the ILS approach (Well it did yesterday) which I personally think is damn good value for an airport with good facilities close to London.
The £50 - £70 I pay at Exeter and Newcastle is a bit steep in my opinion.