Stress of being slaves to a bank for the rest of their lives when wages and jobs in those areas are shrinking, and while they watch the planet being trashed.
They were actually better at it than the bees from memory.
Wage costs I'm sure would be an issue. Sounds like a crazy idea, but can't we just stop using pesticides that have provably been shown to harm a critical part of our food chain? I don't particularly care if Bayer loses profit, or if I have to pay a more realistic price for fruit and veg.