Mass Effect isn't even remotely the same situation, and I'm a little disappointed that that was the best excuse you could come up with.
No, planning sequels ahead of time is not an obvious cash grab, especially in ME's case where all three games are so different from a gameplay and structural standpoint. It was explicitly stated that SC2's business model was to split the game up and sell it in three parts just to maximize profit. We know this, but you'd rather point out that other companies make true sequels to games instead of cashing in on the same one again as if it means something. How much content is present is completely irrelevant because in the grand scheme of things, Activision-Blizzard is fully aware of what the game plan is; sell what could be a $60 game for $180 over three years.
You can go on about the campaign all you want, but SC is most famous, as far as I can tell, for its multiplayer. Is so much going to change between this version of SC2 and the next that you'll be able to buy it for full price and be satisfied? I can't imagine them doing an overhaul of the entire system just to make it worth it. It would probably just get done in the same vein as Call of Du-...
Hey wait a minute
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I like how each new topic you make reveals such varied facets of your idiocy. - foolmo
Now this is entertainment!