[simfoo]

It doesn't take into account Steam sale prices. I did not pay $140 for my games, more like $30. That's a huge difference.

[Semaphor]

It can't. And no, I didn't pay $750 either (closer to $100). Because Humble Bundles aren't included either.

[hobs]

Right, but the "value" then is a fairly fluid metric based on what people will actually pay and the like, so it is just a rough estimate.

If they even did get the purchase date of the product, correlating that with every steam sale is probably nigh impossible.

[Zikes]

It's the value of the games you have, not their purchase price.