Witches didn’t get paid in money. If you were doing it for the money you were a witch for the wrong reasons.
This didn’t mean a witch isn’t paid – it doesn’t do to be in debt to a witch – but they get paid them in other ways. A sack of potatoes, a few chickens, fetching firewood, respect. Respect was a huge currency for witches, as were favours. Respect and favours could go a long way, especially if the village was fond of bonfires.
You don’t take more than the person can give, and you don’t take what you don’t need.