Drasilmarsh drop rare trinkets quite often. It can also drop earring, but not in ogung, you need to farm level 24 mobs, and you can see earring. So it's ok.
BC drop rings in same way: you need to kill the level 28-29 mobs in the rooms, and with a lot of luck you can see a rare ring. And it's ok too: if people drop rings in mainframe, their price will fall to 1 gold in no time.
SF mobs level 32-33 drop rare earrings.
No need to see earrings in IV: IV is still the most profitable dungeon for lowbies.
I agree the dungeons should change by Abyssal Temple and next. As someone stated few time ago, 95% of new players leave game around level 42-45. So THE problem of Scarlet Blade is absolutely related to that range. So yes, nerf a bit mobs and sub bosses (Simon is the only one good atm), make Zeta uniqs drops and rare earrings. Nerf Nemesis bosses (Catherine is the only one good atm) and make then drop uniqs a bit more often (similar to Viledon bosses can be good). Catherine should drop uniq accessories too like Asmodeus.