Yes, I agree that they are useful animals and I wouldn't mind one or two now and then. It's just that my girlfriend said to the reply of MDV "yes, I'd rather have flies then!".
The irony is that she is from Venezuela and lived close to the rain forest, so she has seen very big and dangerous ones (I think the Black Widow is native there). She just really hates them and I find them... uncomfortable.
I was hoping that maybe there is some weed or plant they can't stand, kind of like cedar wood against moths. A natural remedy would have been nice.