Hello,
I used that product, or attempted to use that cloaker. You gave a link to above, on a gambling page, a year ago. I didn't really notice any hits from it that's why I'm not posative I had it installed correctly. After a while I just turned it off. I purchased only one domain key and actually still have the link to my members area but I do not use it. Esp. now that I'm doing adsense. I think cloaking would be best for affiliat marketing. And put it on a junk domain with a redirect to your main site that way if it gets banned your main domain is still fine.