I'm curious about 2 things.
1) What first interested you in this lifestyle?
2) What inspires you to remain interested? If your answer is the Bible, please list some specific passages.
I'll start in the comments....
I was a precocious reader and ended up reading adult science fiction around 7-8. One of my favorite authors was Robert Heinlein who occasionally has various forms of plural marriage in the backdrop of his various stories. I reread them all several times and was reexposed to the concepts as I got older. The older I got, the more critical of his notions of a group marriage or a line marriage I became and the more it seemed like lumpheaded nonsense when compared to tried and true polygyny.
There were not a lot of resources around for me to explore these ideas but luckily I lived somewhat near a west Texas plig community (not Warren Jeffs)snd when I asked my grandfather about this odd neighborhood with a fist full of huuuuge houses in the middle of nowhere scrubby desert of west Texas, all he would say is "that is the polygamists.
As a teen I met a girl and more importantly I met her best friend. They both liked me and it was suggested that they could both date me and hit me with the proposition. Imagine a high testosterone 17 year old saying no. Well it did not last long with one and the other is glutton for punishment to the extent that she is 6ft from me and helping our son with reading.
She had read the same stories it turns out and to be frank, she has at least three standard deviations over the mean in IQ, so she is more likely to think things through rather than knee jerk to whatever the culture has inculcated into her.
Later we met the second woman I would come to marry. She is also exceptionally intelligent and via exposure to fiction and reality shows about plig life which also apparently got the noggin joggin.
We stay interested even though my second marriage broke up at more or less the national average timeline. Not to my mind because of the polygamy. The end result is that having lived it for several years, it became obvious that it was simply natural. The additional internal support and larger base of adult resources whether in earning potential, care for children or one and other or simply having a much larger and more encompassing safety net.
Oh, and because I now had direct personal experience proving my thesis about loving a second woman not changing the love for a se one wife beyond enhancing it.