I don't know. Playboy can probably answer this too...
http://www.playboy.com/
Or how about Hustler? They sell magazines. You should get a cut of that!
http://hustler.com/mansion1/home.php?cs=1&w=420901
What about BangBus? They sell T-Shirts & DVDs. Where's your cut?
http://www.bangbus.com/t1/pps=comein/
Hmm, Penthouse sells magazines too! WTF?
http://www.penthouse.com/
Woah! FTV girls sells DVDS from their tour! How much of that is yours?
http://www.ftvgirls.com/models.html
Twistys sells DVDs on the bottom of the tour... no ref code passed.
http://www.twistys.com/
Girls Gone Wild is selling their products on their tour! WTF?!?! How dare they!
http://www.girlsgonewild.com/
This is very common for a tour to have a store up, especially actual Studios that produce the content they build their sites around. Not all studios do this, but some do, and they have every right to. I don't know what the fuss is about. You see it daily. When you join an affiliate program to push the site, you earn PPS/RevShare based on the JOINS you send to the site, not their products, unless they offer this, which they will let you know when joining their program if they do or not. If you want a cut of their products, you should open an adult store in your local area, and order from them to distribute them, or if it bothers you that much, only promote sites that don't have stores.
But IMHO, insinuating "theft" of traffic based on something that has been around much longer than you, and a product that predates your web-existence, your sites and your traffic (ie, stores on tours, and the Shane's World Empire), is simply incomprehensible, unfounded and borderline inflammatory.
Cheerio. Have a good day!