If you need 2000m, full ILS and ATC etc then it is obviously going to cost.
There you have it... It's "obviously" going to cost, i.e., the customers accept that it will cost, i.e., it
will cost.
You could just as well say: "Since you don't need all that stuff, you
obviously shouldn't pay for it. But since it is impractical to build two dozen airfields right next to each other, with different runway lengths, IFR navaid levels, ATC services and differing landing fees, you get to use the full facilities for the cost of what you'd
actually need."
That approach works perfectly well in other European countries, to everyone's benefit. It would work just as well in the UK.