I don't think sigs should be banned but yeah, I think some have gotten out of control. I agree with Bearcat's sentiment that some are on the verge of being NSFW. I would like to be able to see sigs all the time. I guess that's just not possible. I will just have to continue to use the At Work feature.
You can't buy happiness. But you can buy beer. And that's pretty much the same thing.