 How much can residents of Wales earn? In Wales, the northern county of Gwynedd was found to be the most lucrative, affording those renting out their room on Airbnb with an average earning of 63 per night. Ceredigion and Pembrokeshire followed, both with an average earning of 60 per night. Across Wales, on average, people ... Britons could earn over 670 renting out through Airbnb... 