And more CPU cycles to use, since you're not running AV.
That's kind of a scary place to put yourself in. I see this a lot with the Apple folks too. Honestly, how to do know you have no viruses, malware, sniffers, etc if you have nothing watching for it? It's like taking all locks, alarms, and cameras off your home and then proudly stating that you know it has never been broken into. How do you know that no one has walked into your home, made some toast, cleaned up after themselves and left?
I watch Apple users take this same approach, get a malicious add-in on their browser, and then wonder why their system runs slow. Granted, the majority of the bad stuff is focused towards Microsoft, but that doesn't mean it can't happen on other systems. At all the hacker conventions, EVERY OS gets hacked. On Linux, you are safer than being on Windows, but you are kidding yourself by doing nothing.