I tend not to bother reporting SPAM that originates from the far east as you tend to hear nothing back. US & Europe tend get reported if they've got through the SPAM filters and I've got the time.
I've never (yet) had an abuse report concerning one of my customers, so I guess I either have good customers or have been lucky

I did however find a cracked copy of VB and a set of links to pirated ebooks on a server audit a while back, they were both reported and closed down (ToS violation) as they failed to comply with the copyright holders requests.