Primarily, newer sets are more available and generally less expensive than older sets
Because the original version of the Reprint Policy only restricted white- and black-bordered reprints, the gold-bordered World Championship Decks did not violate the Policy, despite containing several reprints of Reserved cards
If you spend 5 mana to draw some cards at instant speed, you can cast something good from your deck with pseudo-flash
It then has a GY effect to send a Ritual Spell to copy its effect, enabling "Baron"/"Baronness" to act as disruption
If youre going after a shiny for its appearance rather than its collectability, this can be one of the best ways to get a card for a bargain
Its fast and disruptive, and it rewards aggressive play and careful timing