So no SC2 for me. Not even if the "expansions" are $20 each. That's STILL a $100 game. I don't pay more than $50 tops for games unless they are EXCEPTIONALLY good (Mass Effect 2, for instance. Up to 144 hours on that game. Money well spent)
Rather than some arbitrary, if it's split I don't want it stance, I prefer to look at the package as a whole and see if it actually resembles what they asking for. I think, if the Zerg and Protoss expansions are anywhere
near as well thought out and narratively interesting as the Terran campaign, they would insane to charge $60 for all of that content. That's just going on the basis of the single-player campaign, too---assuming for a moment that is all Starcraft is about. Which is of course absurd.
Now if you want to see a good example of shoddy product value for the asking price, that would be The Sims 3, and endless siege of buggy, thinly executed bilge that will likely end up in the $500 range by the time they start it all up again with Sims 4.
Blizzard has done well by me. I never really got the appeal or WoW, but their games tend to have lasting power and as another pointed out, they support that aspect in a way few other companies (especially mainstream ones) do.