I'll never understand the thrill behind it. You don't get any money out of it, you don't learn anything worthwhile, you can't make a living out of it and you can get your ass ripped apart in court if you're getting caught.
If there'd be any practical reason to spend your time with hacking and writing a virus, I'd understand it, but there's no reward at all. Except that it probably turns you into an asshole. But anyway.