This topic has been moved to the Fireplace because we don't believe it to be about polyamory.
The commercial nature of the relationship is what removes it from the realm of polyamory--if the relationship wouldn't have arisen without the commercial aspect and only continues because of the commerce, then it falls outside the purview of polyamory. (Some may argue that it does fall under the rubric of polyamory; for the purposes of this site, it does not.)
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.