That's sort of debatable on "not secure at all". AIM isn't encrypted, yes and can be sniffed but it goes like this.
Your Data Packet is a fish in the river.
If the sniffer is at your Internet Service Provider, the river is rather small and not many fish.
The farther away you go from your computer towards AIM, the bigger the river gets. My IP Relay I bet uses a pretty big pipe or river too.
So getting your information, would be the same as reaching into the river and grabbing an exact fish (and this would have to be done hundreds of times over a single session)
Unless someone is speficically targetting you, the chances that your AIM-Relay conversation will be read by a third party is pretty slim.
