Panjandrum
A regional airport needs the facilities to attract the business it is seeking. If that business is Commercial Air Transport which requires ILS and all the trimmings then that's what they have to provide and one assumes they price for CAT accordingly.
Having catered for their main revenue-generating CAT, any GA traffic they slot in between is bunce. They don't have to employ any more staff or provide any additional facilities to do it. If someone wants to use the ILS then by all means charge them for doing so. If you price GA out of the mix you'r not making any saving and you're throwing away the chance of additional revenue.
This seems to be well recognised outside the UK.
Obviously when an airfield gets to the point where it is saturated with CAT and there is no unused capacity it's a different story.
The guy who started this wanted to pick up his friends after their arrival at Luton, seems simple enough if there is the capacity available and it would be possible at most regional airports outside the UK for a price far less than was paid by the passenger for the entire incoming flight including airport charges!
Shoreham seems to be able to provide a hard runway and ATC for around £15 a throw since you ask. Kemble has a runway that can and has taken 747 and Airbus and charges £10
Mike