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You might not have to buy the expansions, They might be mostly for the story side of it, and any new units can be added through a patch. SC2 will have a massive singleplayer, this Terran one will be as big as the whole SC1 story was, there is something around 30 missions which is why they added expansions.
I dont think its greedy of them when the SP experience is so huge, I used to say the same thing you are saying now, until I learned how big SP actually was.