I go metal detecting (very unsuccessfully)I must say.And yes you do get both sides of people good and bad but the club i am in is very good and very keen on reporting finds etc and has a very good rapport with their finds officer.
A small club so not absolutely blitzing an area.Some other clubs are run on a profit making angle and you tend to get the arsey pillocks in them.
Speaking from experience here but all the members are very generous with their time and knowledge .
I think i have found enough broken/rusted tractor parts to build my own