Is there a (short) simple overview of what abuse-c contacts are, and why they're useful?

I've been in contact with a couple datacenters who respond to my abuse reports with "please see this other address, like whois says".  I let them know their abuse-c entry points to their email address, and they proceed to tell me the exact same thing.

It would be quite handy if there were a page with a short description of what it is, and why they should implement it.  So far, the only thing I've found is https://labs.ripe.net/Members/denis/creating-and-finding-abuse-contacts-in-the-ripe-database , which is pretty detailed.