Why don't we complete the games we start? The industry's common response is that people don't have as much time as they once did, or that the modern audience's tolerance for difficulty is markedly lower than it used to be. There's truth to both of these statements, but there's also a ridiculous nostalgia behind them. It implies there was a moment before Rock Band and Wii Sports when we all finished Super Mario Bros. and beat Metroid without the help of Justin Bailey. The late '80s and early '90s have become a sugar-coated era in game history that many game developers seem content with simply refining. In truth, the answer is more complicated than either of the aforementioned explanations.
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It bears mentioning that there's a cultural bias against videogames that keeps deep, prolonged engagement with a game from being socially acceptable. We bestow finishing difficult books or sitting through long, artistically challenging movies with a dignity playing videogames just doesn't have, perhaps deservedly so.