"All you would need to do is take a 1x1 pixel image hosted on your server externally somewhere, imbed it into a post that you make, on the back end you can setup logging to see what ip addresses hit your image.
Ahhh.. you are right. But the 1x1 image (or any image for that matter) linked back to your server would give you a flood of IP addresses, with no connection to usernames. Even the IP addresses of non-members.
I was pondering the realistic possibility of someone harvesting IP address/username combinations. Like some of the other users have stated (as well as you), what do you do with it even if you get the IP address? You can't get the exact ID of the person from the IP, and that alone casts doubt on JTB's claim - because there's no payoff. The payoff for all this "hacking" would be the identities of the active elders and users that leak information they don't want leaked, I would think. But JTB was claiming getting the IP address for forum users was very simple. Even this doesn't seem to be the case...