It's also a marketing problem. I find games all the time on Steam that are a year+ old that I would have bought long ago if I'd even known they existed. It's a problem with small indie developers - they either don't know how to or don't have the money to market their game and just hope putting it on Steam will get it visibility.

While the page is important, there is also the need to get enough attention for the game so that people even visit the store page.