With 50 lvl character you can make a profit by doing Hunting Horn task for Rotting Wood.
Yetis on Folda/Chllfroest are good option, but rather for making profit from calling other players for cash, than counting on lucky loot (Bunnyslippers).
With 50 lvl you could try to face vampire lord boss - Zevelon Duskbringer.
You can check some other bosses for low level players from FACC and PACC area.
You can stand on a Midnight Panther respawn and "sell information" about it for bestiary-hunters or players interested in mount.
BUT! I definitely recommend to focus on hunts in places where you can loot imbu items, because it gives a regular profit and you don't need a huge luck to make a big money.