The fact of the matter is, there really is not such a thing as unscrupulous traffic sites. Sure, some of them may seem to skirt some of the rules that up with out by the search engines but to be perfectly honest, as long as the person is getting what they came looking for, there is no harm. The only harm really comes to the people who are not willing to step outside of the boundaries and take some chances in this particular area.
There are some reasons, however, that you may want to avoid the tactics that unscrupulous traffic sites use on your main domain. If you're going to experiment with a little bit of black hat marketing, even if you're not going the whole way to the dark side, you may want to make sure that you buy an inexpensive domain and do your testing there. It's an excellent way to pull in targeted traffic, just make sure that you don't damage your main website in the process.
John Stover is the owner of WebTraffic2night.com. Are you looking for the best targeted website traffic? Go to a href="http://www.webtraffic2night.com/targetedwebsitetraffic.html">Targeted Website Traffic

