Mr. X99, this is an ungoing subject all over Europe and nothing new.
In the USA, the airfields get subsidized through the sales of fuel, in Europe there is no such system (it was a 40-yr. contract with the government that ran out a couple of years ago and I assume was renewed).
As has been mentioned, airfields cost a lot to run, from up-keep of the general condition, including mowing the grass on non-paved fields or between runways, to re-doing the markings regularly, plus keeping the rescue equipment in good shape, lighting both on the runway and apron if you have night flying, running the radios and other equipment, and perhaps paying some personel to do all that! And then there are the usual utility costs.... electricity, water, sewage, etc. etc.
Not all fields are able to run on volunteers only. Some club-run fields do lots of stuff for free, but some things still need to be paid for, and some clubs don't have enough members to keep things going and need outside help. Or no one in the club has the necessary experise (plumbing for the clubhouse, etc.).
So, keep dreaming....
