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[Jade]

On the flip side, the sort of catalyst resulting from an open relationship (jealousy, insecurity and whatnot) can not be replicated with a single partner.

I don't think this is true. It's a different type of jealousy, but I think many, if not most mated relationships experience jealousy at some point. In fact, monogamy is what causes jealousy - if everyone was polygamous and okay with it, how would jealousy be created?

I think you are right that Ra's gist is that monogamy creates more catalyst. 3rd density has been refined for eons and the veil has been thoroughly trialed and errored as well as other archetypical biases of the Logos to create the proper level of dynamic tension. The "mated pair" is important, in fact, to this Logos - just take a look at the archetype cards! The whole concept of polarity is presented as dedicating yourself to courting your mate, whether it be STO or STS. The fact is, the act of sacrifice/letting go is important - for instance, to offer as a service to someone, that you will pursue only them romantically, and release the possibilities of pursuing others - metaphysically, this service has a great charge.

Ra refers to sacrifice as "that which can only be gained by the losing". I can understand the appeal and desire of polygamy, but I also have one of those mated relationships where it's quite obvious to me that we've spent lifetimes refining our love for one another, and I can imagine any apparent sacrifice I've made along this path has been worth it. Ra calls it a "jewel dearly bought".