AFAIK the CCUs and upgrades are always the difference in price, except when its a side/down grade, its a $5 minimum, so going from a Phoenix to the Taurus, costs $5 despite it being 2-3x more expensive. So it shouldnt cost more to CCU up from an Aurora to a Idris via 10 ships, as long as you're upgrading.
I have no doubts, but theres a lot of stuff they've promised which they've made clear may not make it to the 1.0 launch, it'll be added afterwards, like procedural generation, extensive internal modding (like playing The Sims inside an idris).
Theres the full launch, and then theres going to be years of updates & content, some paid (DLC missions like SQ42, not PU DLC) and most free content, all paid for via pre-release plendges, DLC packs, and people buying currency and buying the game after release.
Its been answered already, but 2 key elements are that the people who are making these videos, and those coordinating it, are actually using these to practice to a degree, they're not n00bs, but its helping them with storytelling and seeing what works with the tools available (those not available, they need to implement) and so its not like they're holding other things up. All of this will then be put to use for the SQ42 type stuff where there is a story to tell.
The other aspect is that these are the equivalent of Star Citizens trailers. Every game pumps out trailers for their games in the build up, these are just that, they build hype and interest in a very different way, and while its hard to show what a PU will be like without building all these cities and universes, ships etc (the initial trailer is still about the best example we've had until the CitCon landing sequence, and thats it really) this conveys the universe, with what is available today, and is creative and fairly unique, rather than a generic montage of clips.
I dont think theres anything CIG which doesnt make sense tbh, very little anyway, afterall the funds they raise have to be used carefully. They've been very clever with what they've done, IMO.