This one's a "no brainier"
but,
no matter what you're hunting for,
detector/s cost, gas, batteries, coils, wear & tear on the vehicle, etc. etc.
and when you factor in these cost, and weigh them against your over-all liquidable value of all your finds,
you'll soon realize that you're lucky to recover these cost no matter what you're hunting for/finding.
Think about it,
say every sat. morning for 5 yrs in a row you fill up the car with gas ($20.00 for an avg.) and hunt every Sat. for most of the day ea and every Sat. all yr long,
xs that by 52 Saturdays per yr = $1040.00 xs 5 yrs = $5200.00 in gas alone,
travel X amount of miles ea yr, and pay for oil changes due to your travels (1 per yr due to detecting) at $35 per xs 5 yrs = $175.00
batteries 5 xs per yr at an avg. of 10.00 = 50.00 per yr xs 5 yrs = 250.00
2 detectors bought in 5 yrs for a total of say $1200.00
2 extra coils over the 5 yrs = another $250
probe, diggers, etc. over 5 yrs = $300.00 easy
Grand total for 1 day of hunting per week xs 5 yrs = $7375.00
divided by 5 yrs = $1475.00 per yr
start going detecting more than once per week, and start adding extra gas cost, battery cost, etc. to the equation, and soon you'll see that it's costing most of us probably on avg. $2000.00 or more per year,
anyone here finding $2000.00 per yr in finds??
(and remember- that's only breaking even on invested cost MINUS your actual hunting time invested) and not counting any other cost associated with detecting.
so
to profit from it in any form (whether finding coins or jewelry)??
you'd have to triple your finds per yr (in the same amount of hunting time) to make it even close to worth while monetarily!
Do some people get lucky once in a while and find a nice ring/etc. worth a $1000 or more?? Sure, but,
not usually, and not often! It's hard to sell a piece of jewelry to anyone for any decent money too because,
jewelers, etc. will only pay 10 to 20% on avg. of what it's actually worth/retails for. You may find a ring valued at 2000.00 but, the jeweler will only give you 200.00 to 400.00 for it (or a pawn shop, or antique shop, etc.).
I detect for the fun, adventure, thrill, history lessons, exercise, etc. (and the occasional good find)!