Not killing spiders is actually a great thing, as if they are able to survive inside your house, that mean they have enough food to survive. Given the fact that

Not killing spiders is actually a great thing, as if they are able to survive inside your house, that mean they have enough food to survive. Given the fact that they mostly eat bugs, mosquitos and other insects, they are quite beneficial indoors (that also means you probably have more insects in your house that you would feel comfortable with).