Fiat currency has never been used for evil things am I right? 
Anyway the focus is on digital currency not the moral dilemma of decentralization and how we victimize our so obviously benevolent government. Excuse me while use a voice changer while donning my handy dandy GuyFawks mask.
Anyway, jokes aside, the advantage is that that transactions of coins is more seamless. Its roughly as seamless as using the auction house in any MMO. This combined with the fact that items in video games do hold real world value anyway, yes even the games you currently play right now, its only natural to begin thinking this way.
This is absolutely something to be watching closely.
PS: In 5 years a bitcoin will likely be worth 10-50k at its current rate.