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Spammers get other spammers info all the time. When they buy the mail lists, they get each spammer that had that list before in that list since each spammer adds their e-mail address to the lists that they send out so they can verify that the spam is getting through, when they are no longer getting the spam then they sell the lists, move IP's/ISP's, etc.
I know EXACTLY how they work because I found a few invite only spammer message boards and SE'd my way into them a couple years ago. I was given copies of all the different software they use, all their secrets, tips and tricks, etc. They found out who I was after a month but by then I had everything I needed. Plus the #1 spammer in the world is based about 45 minutes from me and I know people who's worked on his network. He knows who I am and avoids me like I have aids and for good reason.
I also have lists of all the IP blocks they use for 90% of their spam and have them listed in my firewall so they can't even think of connecting to my smtp servers. It's rare that I even see what spam looks like anymore.
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