Probably, but at the same time, a lot of the stuff in it tends to have vastly overstated value. The mere existence of a quarter or half of a rule doesn't fix the missing portion. Look a
t the recent thread trying to extoll the virtues of the dmg's variant tactical rules as an example. Someone else in this thread mentioned alternate currencies, eberron has always ghad copper crowns/silver sovereigns/golden galifars/platinum dragons, darksun has a whole complex system of ceramic bits
(I don't remember it)... but you'd not know it from reading about faerun's obscure currencies on dmg19/20. I've tried using it many times over & it just results in confusion without adding anything. What's worse is that if you try to alter the economy & prices of stuff you run into a big mess because lots of spells & class abilities have gp prices rather than objects that have a price.