£100 is common around Europe
We must be flying in a different Europe. Got back from Poland with the Super Cub, and of the ten or so airports that we used, in France, Germany and Poland, only one cost over six euros. One was free, including the hangarage.
Ok, no instrument approaches, but in three cases we had an overnight in the hangar (the weather wasn't very nice). No-one charged us for camping on the airfield, either.
I did get a free landing at Le Bourget this year, as well, but that was the ladies' day fly-in so it probably doesn't count.