While Traditional foils are considered the same foils you can open in packs today, there have been several iterations of this process
But for me, the main reasons I use these binders are first, to hold my expensive Commander cards that live in multiple decks
#10 Hare Apparent Set: Foundations Market Price: $3.40 Like Cid, Timeless Artificer, Hare Apparent dares players to jam as many copies of this card into their deck as they can, which inflates the demand for this card over similarly popular cards that are limited to four copies per deck (or one in Commander)
Errors range from minor ink smudges to major design issues that change the cards appearance or text
I mean, its better than to just buy him an off-the-shelf birthday card, right
They're buying the experience and the content, not the card value, which means they'll sometimes pay above-market rates for lots that have visual appeal (binders, tins, diverse eras)