They need cleaning to preserve and protect them. Your club is building Bad Karma.
If it's YOUR gun, clean it. What the range does with theirs is up to them.
100 shotguns are rendered unusable by neglect and grunge for every one worn out and shot to pieces.
Your club is asking for trouble further down the road.
The club is 50 years old. They already are pretty far down the road and don't seem to be having a lot of problems.