I think this "feature" is not only applicable to consumer, but also to business users as well. My company's has a few static IP address but for some reason the IP address on the other end changes, though it's not changed to 58.27.x.x but to 219.x.x.x as far as I can remember.

Can someone verify this for business users as well?

I've not been proxified yet despite having the 115 ip address. Just tested RS just and I was maxing out my 1mb connection (Deutsch Telecom server). Tried MU as well, maxed out my connection too. Torrent is slow though when I used the Bitcomet mod from the other thread, I maxed out my connection too. I'll probably stick with my current IP as long as possible.