I'm a fan of micro-expansions, then I can cherrypick just the parts that I want without having to buy everything. The trick is making sure the price and the amount/perceived value of content match. Originally, if I recall correctly, Bethesda messed up and over-charged for horse armor in Oblivion and later it came down to a more reasonable amount.
I'm also a fan, as Kitkun is, of releasing bundles at some point.
Hate those little boosterpacks. A few years ago it was a matter of course that the developers supplied their community with extra content which was free!
When was free extra content a matter of course? Hardly ever that I can recall and certainly not a "matter of course". Though Stardock does have a history (GalCiv I/II and now SoaSE) of providing a lot of value after the initial purchase, I don't expect them or any company to keep adding significant new content in for free.