1- Theological: based on my selective reading of the passages I like in the Pastafarian Gospel (and skipping/omitting the passages which do not support my opinion), I concluded that Pastafarians cannot condone Cthulhuism, even as a syncretic sub-religion. So, arrh!
2- Ecclesiastical: as other religions excommunicate or ban form interfaith groups, I feel our Holy Church of the Sacred Flying Spaghetti Monster would gain in stature if it prove that it can too be intolerant of dissent and able to squash any belief not condoned by its priesthood (the forum hosts being the closest to a clergy that Pastafarianism will ever get). In this framework of reference, you, Edhopper, would become the first sacrificial lamb on the altar of the respectability of the Holy Church of the Sacred Flying Spaghetti Monster. So, double arrh!
3- Social: if I, in everyday life, can drop casually in conversations (like between one trillion and one zillion times per day) that I mercilessly wielded the ban hammer at a well known website, my social prestige would shoot up through the roof and even the postman might ask me for my autograph. I like that reason #3.
Having thus decided, I will uncork a bottle of my best aged pirate rum and start swilling a bit of it to celebrate my decision. Then drink some more while looking for the ban button. Then finish the bottle while considering what an awesome decision I took. Then I'll sleep and will have forgotten all by tomorrow.
If you're not banned by tomorrow, consider it a temporary rum-fueled respite from my just wrath.
RAmen.