Are we looking at a potential future of no more change, rubber wedding bands and people who don't wear jewelry to the beach.....UGH! Unless they come out with a detector that goes 6" deeper everything will be hunted out in short order.....Say it isn't so!!!!
For east coast beaches I have hunted its not so not by a long shot. There are unimaginable amounts of targets in reserve waiting to be released. The beach flips itself end over end, old targets pushed up onto the beach over the top of more recently lost targets so you have an old layer on top of a new layer. FEET of sand and targets are pushed from out in the water up onto the beach by the ocean acting like a giant bull dozer. Another storm then with the right wave action drags the sand and targets back down from the beach into the water. They tend to sit in a trough between the beach and the outer sand bar. This trough moves in, out, and sideways. The ocean digs deep holes and spits targets long buried up onto the beach, its incredible it will spit gold rings even pretty heavy fishing sinkers up onto the top of the sand. These honey holes can last for a single low tide or several before they close up. Breaks in the outer sand bar under the water (this is where rip tides come from) allow waves to charge up onto the beach at full strength vs losing some of their energy on the outer sand bar and scoop out section of the beach, a valley or bowl.
Beach hunting is NOT like hunting a park or inland site at all. Beaches unlike dirt in a park are constantly changing, flipping, moving and its feet at times 10 feet of sand gets washed out. No need
for a detector that can go 6" deeper just wait for the ocean to remove that 6" of sand for you.
your absolutely right beaches near me always give up the goods and the private ones that don't get machined cleaned are killer I go out after a big nor easter find the washed out drop offs and the coins are laying right on the surface with foot prints on top of them! I found a 1923 merc just laying on the surface after one such storm..
If you know where to go after a storm, you can find 1700's Spanish 8 reales laying on the surface.
http://www.coolidgeamps.com/pics/8reale.jpg