good question. I think the something and the nothing are one in the same.
Vacuum Energy is a result of something from nothingness, apparently. Maybe the nothingness from which Vacuum Energy originates is only nothingness from our perspective in this material world.
Anyways, why is there something? I think it has to do with creation itself. These are just my ideas, keep mind.
There first was the creator, who was and is everything, the whole universe, including all living and nonliving entities. This creator is the only true god. It existed as true unity, a single cohesive whole. It desired to know more of itself, to learn and to grow. However, as a whole entity, the singularity could only know so much of itself. So it split itself into individuated consciousnesses (big bang type thing) and allowed those individual consciousnesses, given their unique perspective by their ego and the transcendence thereof, to learn more and more. All individual consciousnesses will eventually learn enough to merge back with the creator like a drop of water in the infinite ocean.
The "soul" or eternal consciousness of each living thing, and even things we humans do not consider to be alive, continues through various lives and incarnations in various realms as it learns spiritual lessons, lessons of love and wisdom and free will and the act of creation itself. Evolution is a grand scale spiritual evolution manifesting itself in the material realm. Our bodies and everything in this world are temporary, transient. Ego allows us to see ourselves as separate from the creator and to transcend that illusory separation in order to learn more. Each ego/incarnation has its own perspective and thus can learn more of other parts of the creator from that unique perspective. In the end, we all serve the Law of One/Unity without fail. We serve each other, we serve ourselves.
As others have said, however, something and nothing are two sides of the same coin, but are complementary sides indeed. One may argue that the universe is completely and perfectly formed, or completely (and perfectly even?) flawed. You can say it's either and be right, depending on your outlook on life. The universe is infinitely interconnected and thus a single unit in truth. Spiritual and physical ideologies profess this truth of unity. I think that either everything is perfect, because the only way things could be is the way they are. Thus, the universe is a wholly self-fulfilling prophecy (w/ regard to physical/metaphysical laws). The only flaw I can find would be if the formative system upon which the universe is based is itself flawed, in which case the evolution of the universe would still be perfectly based on these unbreakable laws.