The premise that the worlds of gaming and culture are separate seems wrong. Games are art. Games are sport. Gaming receives from and adds to culture just as much as anything else.
In the past, we used to criticize television for its passive, zombifying effect on the viewer. Games are more engaging. In truth, people like being actively engaged, and they are very accustomed to being actively engaged without the cumbersome work of directing their own activity.
Completing complicated tasks is, in a way, relatively easy. Defining tasks, reflecting on priorities, and allocating time to work on them--and importantly, suffering the emotional consequences of real world success or failure--is sometimes less pleasant. Games are maximally engaging and minimally taxing. That is their magic.