It adds little value except to make us sleep better at night.

What about the scientists who first insisted the world wasn't flat? What about the first people to say, no, the sun does NOT revolve around the Earth? That we aren't the center of the galaxy? To the people who found out we're just in A galaxy, which is one of many? To me, those things added value, and while thought experiments at the time, they were all proven to be true through science. So here we are thinking we're living in the one and only universe that's ever existed? I find that dangerously in line with the thinking of anti-heliocentrists from thousands of years ago.

I'm not saying there is or is not a multiverse, but all science and history points to "we are not special, and would be naive to think this is the one and only universe there ever has been, is, and will be." We haven't proven it yet, and proving it might be beyond our perceptions and scientific tools, but it seems silly to be so sure of something that, odds are, seems likely. But with every other single step of our history, we've only proven to ourselves that we aren't special, our planet isn't unique, our solar system isn't unique, our galaxy isn't unique, and maybe someday they will prove our universe isn't unique either.

It doesn't answer the question of why the world exists. It just says there are lots of them.

I agree with that. We have a pretty good idea how our universe started, the big bang, but that still doesn't tell us anything about what happened before that, or what that matter came from, or what was here before. It raises more questions than it answers, and so would the discovery of a multiverse.

And I take a small personal offense to comparing the multiverse possibility to believing in God, and saying that god actually impacts ones life. For some of us, space impacts our life for the same reason God impacts other. Some think God created them? Well, the universe created me, and the more we learn about it and discover, the closer we get to ACTUALLY discovering our origins of true creation, and the answer to why we are here. To me, space does impact my life, far more than any God could.