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During the testing of the Steam for Mac beta, it was a benchmarker for preformance and capability of bringing the Source engine over to another platform. Upon the official launch of the Mac client, they made it free for 2 weeks, allowing anyone to get a copy of it.
Later down the road, upon announcing their partnership with schools to use Portal 2 to educate game making in classrooms, they released Portal 1 for free, again.
You must have either clicked on the "free" button at some point, or they just added it to peoples accounts for no reason.