No, rarity does not affect currency in Path of Exile. Rarity only affects the rarity of items, while currency, cards, and gems do not have a rarity stat. However, increased item rarity (IIR) does increase the chances of an item being rare, magic, or unique. Magic, rare, and unique monsters have an increased item rarity statistic for drops. Some players enjoy stacking IIR/IIQ on their gear and farm low-tier maps for things they can sell.
In Path of Exile, item rarity does not directly affect the amount of currency you find. Currency items themselves have no rarity level, so increasing your rarity stat won’t make them drop more often.
Here’s a breakdown of how rarity and currency work:
So, if you’re looking to farm currency, you’ll want to focus on increasing your item quantity (IIQ) rather than rarity.