Whew, something smells fishy.
I would really hope that the price of all three games put together will be the price of a full game. Sadly, I never really played the first game, but Starcraft 2 does sound interesting to me, but this seems to be pushing the edge a little.
I don't really like the sound of having three seperate campaigns of the same exact story being sold at full price (which seems to be what they're hinting at with "Each campaign is treated as a full-fleshed out game"