If you guy wanna make it a little harder to leech your forum try Zipping the lists and attaching them. I hit these forums and R-click "copy image location" and build a metapad list of the URLs, and leech them with "APL"
which allows me to hit around 6 forums very quick and well U know proxys die faster
You can't make it any harder. You could attach it, but it'd be just as easy to download the attachment. It literally takes about 20 lines of code to download and parse an attachment from memory.
I wouldn't really worry about it. If you make it harder for real users to get them, they are less likely to post new batches.