If AI wants to trade a resource with you (on your turn), you can increase the amount of cards and see how much AI is willing to give for your 1 resource. If you remember what cards the AI got, it can be pretty easy to do.
On it's turn it will keep offering more and more and more, so if you are patient and no one else is trading you can get big gains... in the first couple of rounds it traded me 3 ore for 1 wood, it made no sense and gave me a city (much to the anger of everyone) but did nothing with the wood... of course it cuts both ways and has hurt me too, lol.
Wow, I can't believe I didn't think of that. I looked at statistics but didn't specifically look at whether they earned victory point cards. I will keep an eye out for that, but I assume you are completely correct. Thank you!