When you pay poorly you will always get either lower level candidates or high turnover. Teachers, like the rest, need money to live.
Years ago, I delivered sailing yachts all around Europe, the Med, from Europe to The Caribbean and the States, etc. The vast majority of these deliveries were through agencies. The pay meant it was long-term, non-viable. However, it was always sold as "But it's the lifestyle, right?" Sure, for a time. Long-term it was unsustainable though. Same with any job the world over. In that industry, there was always a fresh and regular turnover of yacht skippers sold on the lifestyle. Dress it up how you like, but until that underlying issue is addressed, it'll be same-old, same-old.