Even the cutest [I'll bite] arachnids, I wouldn't want in my house... I think praying mantis and geckos are cute, but I wouldn't want them in my house. Actually that's not true. I have had geckos in my house, but didn't mind because it barely moved and was confined to the bathroom. But I have lived places where there were rodent infestations [it sounds worse than it was. They weren't rats they were rodents that were the size of an egg] and while they were cute, waking up to them six feet from me wasn't a pleasant experience.
edit: But cute things can be dangerous and ugly things can be relatively safe. Many regard spiders as ugly and many species aren't aggressive and choose to run away as their means of first defense. In contrast, Swans; Elk; Hyenas can all pose a threat to humans, but are aesthetically pleasing to the eye. Could also say Koala Bears because of their likelihood of carrying Chlamydia, but the prominent strain can't be transmitted to humans and the lesser one can only be transmitted through contact with bodily fluids, but the odds of coming across a koala bear is much less likely than a spider... unless you go to a zoo or live in an unorthodox location. For instance, I used to live in an apartment complex that had a forest behind it, so it wasn't uncommon to see deer. Same with my local internet provider store where I saw rabbits on the walkway.
I mean, we're hard coded to fear things like spiders because some are poisonous and therefore evolution says we need to fear something minuscule in comparison to ourselves as self preservation instinct.
Extensive exposure could help reduce negative reactions though... I know someone who frequently finds scorpions in his house. Non-poisonous scorpions. He's gotten to the point where when he says there are scorpions in the tub, in his room... its like he's saying I had a sandwich for lunch... lol