Never a good idea to join a sig campaign. The chances of getting banned increase substantially when you do.

I see a few of people creating accounts today to ask why they were banned.
Could someone please explain why it is a lot easier to get banned from bitcointalk forum when posting with a sig? I don't want to receive a ban.
If you in a signature campaign and just spam bullshit for the BTC payments should it not be up to the campaign manager to kick you out of the campaign, I didn't think theymos and the other moderators of the forum would have time to ban people for signature spamming.