This is why I simply run away and let them have free reign of the joint. ;)
Occasionally, they will build webs where I don't want them and I merely clean out the webs, usually when the spider is away. I swear they even have the sense to figure out where web building is not allowed, because I do not do it often.
I was once downstairs on the PC when I heard a large fly buzzing because it got tangled in the web. The spider was there in a flash to make sure the catch did not escape. It was rather fascinating to see how the industrious spider landed its prey.
I came to the conclusion that most spiders behave like conservatives, patient and industrious, whereas the vermin insects behave like liberals, stealing and polluting that which they did nothing to create. Now, if only we conservatives could think of a way to turn liberals into something useful they way that spiders do!