Dear James,
If two identical virtual particles A and B pop up with an opposite energy sign, then there is no energy needed from the outside for their creation: though they create each other out of nothing, ,the drawback is that in that case they only exist to each other but have no reality to other particles, P and Q which may already be present in the universe they appear in. That is, unless both A and B also interact, exchange energy with P and Q, we cannot even say that A and B live in the same universe as P and Q. Du moment A and B start interacting with P and Q, they pop up, 'out of nothing', in P and Q's world, as do P and Q in A and B's world. 'Out of nothing' between quotation marks since 'to exist' means 'to interact', to exchange energy, i.e., to alternately borrow and lend each other the energy to exist. (And, by the way, in a SCU energy is not some stuff you put in the 'tank' of a particle: it is something which only exists in its expression, in its change. It is not some object-like stuff, unlike gasoline is at macroscopic scale, but a quantity which is greater as its rate of change is greater, the frequency it is exchanged at.)
Since particles only exist to each other if, as far and as long as they interact, since in a SCU 'to exist' = 'to interact' I totally disagree with Hermann Weyl who said ( in ''The Physical Basis of the Direction of Time'', 2nd ed. p 165, HD Zeh):
''The objective world simply is; it does not happen''*
a quote which I think represents your view.
If memory serves, in my essay I say somewhere that there is no objectively observable reality at the origin of our observations, with the emphasis on 'objectively'.In classical mechanics the existence of objects is thought of as a passive state, as if their particles, once created, stay created no matter what, as if their existence is a self-evident fact, a static state requiring no effort of the particles, as if they would keep existing even if they wouldn't interact at all. This is different in a SCU: here particles express and at the same time preserve each other's mass by continuously exchanging energy, so would vanish if we could cut off this exchange, and with it the macroscopic objects they form, so in a SCU the world we see is the result of this continuous activity. Whereas in CM, in Big Bang Cosmology, in Weyl's view 'to exist' is a noun, it is a verb in a SCU.
''The .. laws, etc. that you find most useful appear out of nowhere to be applied for free ... ''
No, not for free; it is not I who find these laws 'most useful': as in a SCU particles, particle behavior c.q. properties evolve in a trial-and error process, so do the laws describing their behavior, laws which I suspect are related to all possible different ('orthogonal') ways they can move and spin with respect to one another since here these different combinations of directions of motions and spin affect the frequency they exchange energy at, the properties they have according to one another. How this evolution might proceed is one of the subjects of my website study.
As to 'null point': the non-existence of electric charge, for example, can only be established with an instrument sensitive to charge, that is, an object which contains at least one single charge. Without the existence of such detector, there is no 'null' value to be observed, no conservation law to violate. To me 'nothing' refers to the fact that a universe which can rationally be understood has to obeys the conservation law according to which what comes out of nothing must add to nothing, meaning that the universe is a perpetuum mobile which yields as much as it costs: nothing, so exists only as seen from within.
Anton