I think all the answers are pretty correct.
I also kinda think coins can be buried by dead
vegatation over the years and get deeper vs
the surface. But this probably happens in some
areas, but not much others. But I also agree
that coins were much more valuable back in the
old days, and those that were lost were probably
found to a larger extent. IE: a dime today is
fairly useless on it's own, but in 1950 it was
probably worth two cokes from a machine.. Seems
I remember nickle coke machines around that time..
A dime in 1880 was probably seriously worth looking
for.
In comparison, the house I'm at now, it was built
in 1959, and always had lots of people around the
yards doing this and that. Change was semi valuable,
but not anything most would lose sleep over, unless
a wad of quarters or whatever. I would spend time to
look for a dropped quarter, but not waste the energy
for pennies.
In searching this yard, it had many coins. "over 500
found at this point, and more are still there".
But the vast majority were pennies. The amounts
of clad lost were quite small in comparison. Which
kinda makes sense if more time is spent looking for it.
But also the activity at one house could lead it to have
way more coins than say a house next door. It's all
up to the people, how careless with change they were,
how often outside, etc, etc..
This house always had plenty of children running around,
besides the adults, and lots of change was lost.
There is a spot in the backyard where I think a lot
of lawnchairs were used. Change must have always fallen
out of crunched up pants, as much was found in that
area.
For modern houses, and maybe even going back a few years,
the grass next to driveways is a good spot. People would
lose change out of their pockets when climbing in and out
of cars. Little things like that is what I consider when
trying to decide the best spots to first detect. I try
to think how people would have lived at that house
as far as movement, recreation, etc.
If you had a house that was owned by people that never
went outside, or were tight with the change, there
would not be much to find. So it's quite possible
many old houses are just plain bare of coins.
But I still like detecting any old house, as often it's
the other stuff found that is more interesting to me.
I won't complain about finding old silver though..
MK