Finishing a video game after investing hundreds of hours is always a pretty bittersweet moment. Obviously there's the sense of accomplishment for overcoming all the challenges and obstacles the game has thrown at you; the satisfaction in seeing everything resolved.
However, 'post-game depression' is a frighteningly common occurrence for those who find it hard adjusting to life with a sudden hollow feeling in their stomach. All the hard work and building towards something every day suddenly evaporating can certainly be a strange sensation.
There are plenty of other reasons as to why someone might not finish a game, however.
Difficulty, an abundance of distractions through an expansive open world or a variety of side missions, or the simple fact that the game might not be that good could all be legitimate reasons for a gamer to put their controller or mouse down and look elsewhere.
From the disappointments in a franchise to the titles with so much content it's hard to even find the time, many successful video games end up not being finished by the majority of their players.