90% of my library is digital and most of my friends are 100% digital, saying the boxes just clutter up their apartment.
As far as I can see the only argument is bying used games, but if you don't mind waiting a price drop on used games, why not just wait for a sale from the publisher? The PS store has sales all the time, good ones too, often on AAA stuff.

So I ask you, what's the point?