We've limited additional IP's at the moment since we've had some abuse with that. Users that need to add/remove can ticket and we'll gladly fill the order.
As for 512's, we don't intend to stock them for the rest of the year. They've been a bit problematic for CPU abuse so until I finish the CPU capping stuff we'll just restrict them.
I have no idea if they'll come back next year, we'll see how it goes.
I recommend not cancelling yours if you think you'll need it down the road :)