Interesting that I am totally on the other way around. Occasionally use optical disc on computer (live CD, burning DVD / photo CD for someone else, etc). But moved to digital 100% on console. I own multiple consoles, so one digital copy can serve them all (at once), I can even set primary console to let my wife login to her account and play the same game with me (co-op) on another console at the same time. For physical copy, I have to buy 2 discs to achieve that. But now I can buy one copy and serve more than one players / consoles (at the same moment). Of course, it's also faster and quieter by avoiding the game disc (I use SSHD on my consoles).
I 100% agree that the biggest advantage of a physical disc is that you can sell it. However, I never do that, not even once. Eventually I have hundreds of game disc in my drawer now. So, it become a problem for me more than value.
Anyway, I am now no more a super fan boy of new games. And basically only buy games when there is a big sales, almost never buy any new expensive games. I usually won't buy anything from XB / PS store which cost me >$20. So, I don't really care about the games re-sell value.
For me, it's more like $15 for 2 copies (at least), and never have to worry about the optical drive fail, or disc scratched, etc.