How often do you buy PC games on a disk?

Inspired by Chris Plante's PC thread, I wanted to ask what percentage of all y'all's PC game purchases are on DVD nowadays, say within the last 18 months or so. I can only think of one, Just Cause 2, because I got a random clearance deal on it. Does anyone here prefer a hard copy still? Are you big into collectors' editions and have discs because of them? Or are you pretty much all digital?