Anybody who knows what ML's sales of GPX machines in Australia and North America are is certainly not telling, but you only have to read Codan's annual reports from 2012 and 2013 to know that their real profits are coming from Africa, Asia and South America.
With a new "super gold machine" and a "mid range gold machine" in ML's announced lineup for 2014, it's hard to see a long future for the GPX-5000. With the drop in the gold price, a market for detectors that cost more than $5-6 K seems pretty limited, so I can't see the super gold machine costing much more than the GPX-5000 does. Likewise the mid range machine along with machines like the Garrett ATX would eat up GPX-5000 sales from underneath - not because they are as good as the GPX-5000, but because they are good enough.
It may not mean anything, but the symbols for the mid priced machine and the super machine are the same and we already know that the mid pieced machine is ruggedized and waterproof, boult on the F3 demining detector platform. Steve might get his wish for a waterproof PI from ML with the power and adaptability of the GPX next year.