Amazingly enough, even the most experienced users don't seem to care that a $2500 Metal Detector still takes the form of a Weedwhacker.
It would be very easy for manufacturers to develop quality detectors of a compact nature but the their clients still basically blindly take whatever they sell them.
In this particular industry unlike almost any other the consumer blindly takes the manufacturers word pertaining to the actual form and or quality of electronics that are featured in even the most insanely expensive models.
There is no newly released " fornicator 5000, now featuring the newest Intel processing Technology"
This market is driven more by fantasy so a manufacturers marketing would be more apt to be along the lines of:
The Fornicator $5000, (find treasure beyond your wildest dreams)
That's really all they have to do, they have been experiencing a worldwide Renaissance, and no one really knows what they are buying.