Do you mind going into detail about why you think video games devour life's potential?

Sure. The main thing is that, empirically, they tend to hijack peoples' motivational systems by providing fake utility functions and a constant stream of well-tuned rewards, to make them play for many hours. Those are usually hours that could've been spent on something much better. Some formerly-well-adjusted people end up spending a large fraction of their waking hours this way, particularly people who got suckered into setting up social reinforcement for their gaming habits (MMORPG players who meet friends they can only interact with through the game, and Facebook/Zynga game players who constantly receive and generate notifications to and from their friends about the games.) Even if you're only losing a small number of hours, though, video games are dangerous as a procrastination activity because they're immediately available and more tempting than most other procrastination activities, and they're hard to transition back from.