And to throw in another variable...
I'm convinced that the relative affluence/cultural norms of an area help determine what gets lost and how much of it.
Skippy, I work and live in an area that I'm guessing is about 1/3 the population of your area. It's somewhere around 30k people. I've hammered the most heavily used parks (even using your own methods that you've described), hunting over lunch - a good 5 hours per week when it's not raining and the ground isn't frozen. I've found exactly two gold rings - a class ring and a nugget ring...in 10 years. I've come up with a few other gold medallions and chains and such, and 4 or 5 silver items per year. Much more silver than gold.
I just don't think the people who are out and about around here are wearing enough gold rings to lose. I mean...in ten years...the mountain of pull tabs I've dug...not one wedding band. It boggles my mind when I see your totals. Are you *sure* there's nothing special about the jewelry-wearing preferences where you live? Or maybe the folks in your area are just more careless or clumsy?
The gold chains/medallions (and the nugget ring) that i have found have mostly been in areas with a higher Hispanic or Indian (as in India) population. I remember Digger27 talking about the same sort of trend. Maybe it's a regional or demographic thing?
Anyway, I'd love to have you come here sometime and see if I'm just doing something wrong or what. But then i wouldnt be able to live with myself if you start pulling gold rings out of thin air.
I could be up against competition in the area, but I hunt over lunch...never saw another detector in 10 years. And I've found enough silver. I keep telling myself that gold is just as easy to lose as silver. Maybe it isn't?
Sorry for the rant.
Personally, I think most of the losses are at the sports parks due to one of two conditions. 1) removal for "safe-keeping" ESPECIALLY when greasing up kids with suntan lotion (this is where I find most of my women's rings). If your small town doesn't have any water fountains in the parks where kids get into their swimsuits and get wet, then you're going to have a huge drop in the number of rings that fit into this area. My city, and surrounding towns have about a half-dozen.
Second is the fact that when it get's cold here, it's often BITTER cold in the morning, but heats up quickly, or vice-versa. Low humidity does that. In the fall, there can easily be a 40-degree swing in the temps between daytime and dusk/morning. This means that when people show up for soccer practice at 6pm, it's "decent" out, and then all of a sudden the temps drop 25 degrees over the course of 2 hours. People's hands SHRINK. They lose rings from that in lots of the neighborhood parks, and schools.
You may be onto something, though, around jewelry wearing, too. I live in a high density area of "new" housing, meaning many of the people here are recently married starting off a family. We all know that weights fluctuate pretty much all the time in the first 10 years of marriage (pregnancies, bigger sizes from food, LOL). People get different rings as a result, and often I don't think they're sized to not fall off.
Another thing that makes me think that there's a large population of jewelry wearers is the high schools. One of the high schools here was only 8 years old, and I'd spoken to another detectorist, and he told me the previous week, he'd pulled FIVE gold rings out of the practice fields, there. Said he worked it pretty good, but was sure there was more rings in it. I went back and hard gridded it and found another 7. this year, I pulled a gold out of the back soccer field. That says something about what the students are wearing, I think...
class rings, though, I've only found big gold ones in the surrounding RURAL communities. They're not popular in the city at all. Demographics definitely play a part...
That being said, if your full community is 30,000 people (and it's basically a whole city unto itself), that's probably a very different demographic than a city of 80,000 people all packed into nothing more than subdivisions. The industry/work is in nearby cities... All those citizens here live, and play here, but not many work here (other than the standard service industry dentists, etc...).
Glad to hear you've pulled a few golds out...
Cheers!
Skippy