| Satrapa |
If there is village full of wounded people healing them wouldn't prevent them from being scared and wouldn't prevent danger. If something can wound lot of people it can also kill them ant its not so easy to "heal". So darkness thrives, people are grateful but not saved.
High rewards... because every village is rich and everyone holds sack of gold for adventurers to give it for minor healing...
Remember also that witch is not cleric. Healing witch don't do it the same way that cleric or druid do. The first association to witches are curses. So people should be afraid of them and often expect some drawback of this healing or be afraid of it.
Remember that helping pregnant women, minor healing, love elixirs and so on didn't prevent situations like. "I have bad luck its witch's fault! She cursed me! Burn her!" or "Our lord is fatally ill it have to be witch's doing! Burn her to cure our lord!" and so one.
BTW. I have to read it again and again to find out the real difference between summoner, witch and mage/sorcerer and difference in niches they should hold.