You:

The final paragraph more or less gives the game away: this post isn't really a curious and honest inquiry, it's advertisement for a conclusion you have already reached and are planning to expand on. For all I know your conclusion is correct, but your methods to establish it strike me as suspect.

Me:

I suspect that monogamy is genuinely the best option for many people, perhaps even most.

The only conclusion I've reached is that polyamory is a good choice for some people, and that it might be a good choice for more people if they had some way of dealing with (irrational, unpleasant) feelings of romantic jealousy. Ignoring jealousy entirely, there are still good reasons to be monogamous; a number of them have been pointed out elsewhere in the comments.

My point here is only that you have a choice, and you are better off knowing that you do. Part of knowing about that choice is understanding what the other options are; I'm only proselytizing for polyamory in the sense that I think people are better off when they can make informed choices.