Looks like there is a bit misunderstanding here.
You are right, it was an easy money, but (modern) coins are not my main object of this hobby. I really don't recalculate it for an hourly rate. I thought that I made it quite clear in my last post.
I don't go out with the detector to make money, for me it's a hobby. That means I have a job, which is good enough to ensure a decent life for a family of 4.
One day I'll try to go to some gold fields. Again, not for money, but just as excited hobby-detectorist. I do not expect to find much (if anything), however I won't regret it as I'll spend some time in beautiful nature and not on a sofa at home.
Regarding the beaches in Sydney - at least the main (busy) ones are cleaned very well, even during a day time + lot of detectorists are here
but there is always chance to find something. And a walk on the beach is VERY relaxing, even if no luck - I always enjoy it. However, I'm not out very often, max once a week, usually less, last days were quite exceptional.
All the best.