Who are spampoison?

And why are they inexplicably referrer spamming me?

I have lots of entries like this in my referrer log:

5/11 6:17 am 207.2- blog/article/10/release-early-release-often SpamPoison.com

Which is all deeply odd. They seem to have the laudible if slightly pointless goal of building up a network of email spam honey pots. Which makes all my referrer spam all the more inexplicable and not a little hypocritical.