In most places it's illegal not to have your dog/cat vaccinated against at least rabies.
As far as there being no chance of your cat catching something, that's really unknown. Say you go to someone's home where they have a dog or cat. The dog or cat isn't sick but has been around others with something awful like Feline Leukemia or FIV or any other malady. You play with the pet and get some disease on your clothes. Without thinking, you come home and love on your cat, unwittingly giving him/her a disease.
Ya just never can tell. Hell the shots aren't expensive and you can even do most of them yourself if you can find a feed store that sells the necessary vaccinations in a two-bottle shot format. Buy it, suck out the liquid with the included needle, squeeze the liquid into the powder bottle, suck it all up with the needle, and inject. Simple as that and it only costs about 10 bucks - around here anywho.
There are vaccinations which are complete bull-spinarky such as Feline Leukemia and rabies. Not saying you shouldn't get them but...the Feline Leukemia vaccination is only ~85% effective. Rabies vaccinations are also generally good for a couple of years longer than vets tell you about. Some studies actually indicate that having a pet vaccinated before the rabies vaccine is really due can be harmful.
Personally, I don't see a reason not to. So long as you're not breaking the law, it's up to you. Just please know that you do NOT want your cat contracting Feline Leukemia and watching them crawl around after the disease has caused partial paralysis...horror story-ish, I know, but I have seen it in three of my VACCINATED cats (we live in a high-risk area for this sort of thing).
Sorry for the long post
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