Fuck that. And that dude that was all, "I'd hate for people to spray them with insecticide" is more than welcome to take all the spiders into his home. I use Conquer at my house. Kills the fuck out of all walking bugs as they try to come in, and a good treatment lasts about 6 months. I highly recommend it.
Paragon Conquer - residual insecticide concentrate,16 FL.OZ by Conquer [amazon.com]