When I was in high school, I made a giant life-like clay tick, a member of the arachnid family. That tick won me the art award for the second year in a row. It creeped a lot of people out, with the pointy legs, full of texture you could never see if you looked at a life sized tick.
We kept that tick in our home, our kitchen actually. But then I started to get freaked out by spiders, as they would pop up on me from no where. That did not mesh with my maternal protective instinct.
Now, they mesh with my maternal protective instinct. Why? They eat flies. In the summer we get flies. We get flies because we leave our door wide open. We leave our door open because all of our windows are on one side of the apartment, the door is on the other, so it creates a breeze. I am also an avid crock pot user, and the flies seem to want my chicken. They also are fond of the diaper pail.
That's where the spiders come in. We have big spiders and small spiders. I like the teeny spiders best. I love seeing a teeny spider with a fly. It eats the fly, and you feel like the underdog is winning, even though you know that spider is going to be taking out lots of flies over the course of its lifetime.
I love nesting, and as my due date approaches, I'm cleaning and scrubbing more and more vigorously, parts of the apartment I have never cared about before, like the interior walls of cabinets. When I see a spider, I carefully clean out the web, because my maternal nesting instinct won't allow it to remain, and make sure the spider doesn't get caught in my feather duster, because my maternal protective instinct won't allow anything to happen to it.
Do spiders save money?
If you're patient enough for the spider population to overtake the fly or ant or whatever bug population you may have, they could save you money. I wasn't that patient. Over the summer, I combined spiders with fly strips, but as winter approaches, they don't need any assistance. You can also find all sorts of do it yourself pest control ideas, depending on your pest. In conjunction with other methods of pest control, support your local ecology; let the spiders live.