Cardboard is not hard-wearing, edges get worn, marks from spillages etc are permanent. Sometimes come in a plastic slip which damages the digipak further when removing/inserting. CD's are frequently difficult to extract and the discs typically suffer scratching in the process. Digipaks encourage ripping in order to avoid damage, and ripped files have a habit of being distributed.
I'll pay another dollar for a decent jewel case FFS. Rant over.
I'll pay another dollar for a decent jewel case FFS. Rant over.