Gossen meters are clearly not marketed and priced at the average punter, they are the rolls-royce of meters, even beyond Fluke, designed and marketed to meet niche applications.
Someone mentioned on here Gossen meters are the only ones approved and used by some big aerospace company, that's the kind of market Gossen cater too, price doesn't matter.
$800 Euro is quite reasonable for a meter of this class and functionality.
BTW, it's not just a multimeter, it's a very advanced power monitoring and logging instrument.
Dave.