Giving up on games

Recently, I have been part of several different discussions regarding the abandonment of books/ video games. The main point of debate is if/when it was appropriate to give up on a item of leisure. At what page is it okay to put a book aside. What point is a video game okay to get rid of. What endings are not worth seeing.
To be honest I'm in the finisher faction. I believe caution is the better course than leaving a task half finished. Some might say its sadomasochist, some might say there is so much better things out there to find...so skip on.
And yet, I just can't reconcile it with the tenement that life is work. Challenge is key. At the end of it, you should finish what start.