Even for people who already may own HL2 and/or Episode 1, this is likely going to be extremely popular. Portal or Episode 2 by itself would probably attract moderate sales, so having HL2, E1, and team fortress2 included will only help it further.
Since I'm guessing that this is going to be priced very competitively as a console game, I expect sales to be very high.
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Since I'm guessing that this is going to be priced very competitively as a console game, I expect sales to be very high.