Few big games
Steady buyer
Buys lots, resells
Games you buy per year
Years you keep the console
Typical price of a game
Extra cost of the disc console or drive
Disc copies are cheaper by
Discs you would resell
What a resold disc fetches
Digital console
Disc console
Illustration only: use prices from your own shops, in your own currency. It counts game purchases and the extra hardware cost, nothing else.