That's probably why people like them. Trash and discrimination. The areas I hunt are all newer parks. I don't think a single one of them is over 10 years old. The one trashy park that I found, I dug everything. It's now no longer trashy. I found 17 rings in that sucker. It's clean for next year!
Basically, my style of hunting is "dig everything and sort it out in the pouch." I tested a bunch of my rings on my AT PRo, and found I had 5 gold rings (smallest to largest) ring up as (anywhere between these figures based on angle of attack and ring):
42-43, 44-47, 47-51, 54-58, 59-63
My other men's rings (titanium, steel, tungsten, etc), filled in the gaps from 48-67. When I did the silver rings, they rang up from 62-98
Basically, what I learned in 10 minutes of testing my new AT Pro, is that ANYTHING from 42-98 could be valuable. I was a bit disappointed. Then I just laughed. I was buying it for the water detection, anyway. Digging everything doesn't matter to me, it's how I already do it. My first outing I found a really nice softball token that rang up at 99. I suspect it's silver, but haven't tested, yet.
So... in a nutshell, I found within a week that I could find valuable on ANY range point from 42-99. Yep... AT Pro not withstanding, I'm still stuck digging everything, if I want to find the good stuff.
Please, go ahead and discriminate trashy areas. Leave some stuff for me.

I'll probably find it showing up as the exact same range as the can slaw I'd dug the last 7 pieces, and expected to find another piece (I even called it out to my son), but instead, found ring #100. Gold and diamonds. Target separation wouldn't have helped any. I just dig it all.
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Skippy