Looks like "waste ground" from one angle -
There's also the other side of the coin....
The beauty of motor homing is the ability to wild camp anywhere,
even if there is a campsite nearby. Understandably to the annoyance of the campsite owner. The emphasis is on the owner to make the site as attractive as it can be to make the camper want to come through the gates and stay. I'm not saying Doonbeg camping is unattractive, but I am saying that when presented with the option to stay for free on the side of a road or pay 20-30 euro to stay in an official campsite, the camper needs to see value for money. What are they getting from the campsite that's better than camping for free on the side of the road?
Personally, I've only visited the doonbeg website. It looks small but well appointed and just the kind of campsite
we seek out.
The other option -
Get in touch with the land owner (who is a campsite owner you say) and tell him that folks are camping on his property. He is in the same trade as you and he should sympathise with your loss of income from a situation like this. If he was any good, he'd put up a pair of gates.
Remove competition (the "waste ground") and you then become the only option on
that stretch of road.