I'm not sure how useful the question is (but I'm still curious how people with that particular experience might answer). From my discussions on polyamory with people who are polyamorous, it seems to be rather like an orientation. Some people are only happy in polyamorous relationships, others are only happy in monogamous relationships, while still others don't have a strong preference. A person with a strong preference for polyamory would likely be unsatisfied with a monogamous relationship, while someone with a monogamous preferences would be happy to not be polyamorous anymore.
What I'm trying to say is: This is a bit like asking: What is the effects of experimenting with sexual intercourse with people of the same sex on later satisfaction with sexual intercourse with people of a different sex? The answer's going to vary widely depending on whether people are homo-, bi-, or heterosexual.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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