Manufacturers are limited to the amount of power they can use in the detectors by the FCC. Foreign detectors have no such rules and can use lots more power. Our top of the line detectors seem to be in a rut, but they slowly add new features based on what the public says they want. This isn't good for many users as they still think if the screen says ring, why is it a pull tab.........
Garrett raised the bar with the AT PRO in a versatile light weight unit that can be taken in shallow water and it has a screen. Now only if it had a coil and earphone connector that was easy to plug into it would help a lot. Garrett has added improvements like a longer shaft for the arm rest and cam locks. These will increase the cost of the machine later.
White's still insists on shipping the water detectors with coils that float disregarding the other makers that use a resin inside the coils and they aren't all that heavy to use on dry sand. White's still doesn't have detectors approaching the weight of the AT PRO nor any of the Tesoro's and Fisher's.
Water detectors that have changable coils and head phones are at a premium. This is why the older Tiger Sharks and Sand Sharks command such high prices. These features are prone to failure or operator stupidity and this increases the cost of repairs to the manufacturers.
Can they make them cheaper? Of course just like GM, Ford can make cars cheaper but the public has to have power/heated seats, XM radio, inboard GPS systems, power windows, and the list goes on. All many of us want is a car with good mileage and goes from here to there without breaking down. If we want the extras we can order one with them, but the makers insist on installing the high price goodies anyway.
Geez, I didn't mean to rant on and on. Sorry guys.