As long as they are not linking to your pics directly, boards are okay. As for warez boards. I'm not sure if they convert--the reason people go to warez sites is to leech. If they can leech warez I'd be surprised they'd pay for a site. Unless you sucker em into "free xxx password" bullshit....at which point you've managed to pull one over the fuckers.
You guys have seen these... fake "free password sites" that push "free trials" sites. One way to convert otherwise sketchy traffic.