Frankly, these two cards are roughly equivalent
Doing it in your opponents end step makes it active in your turn, so you can still operate, even with a little mana available
It has a premium, iconic look about it, making it feel like a premium product card
If you dont need the mana, or it's later in the game and you need to keep your options open with more cards, you can cycle it for three mana, discarding the Night Market and drawing a card
While this might not sound like a huge change, that $6 in pack EV actually adds up to almost an entire Masters set worth of value every two Masters sets
Remember, even without a Detective, Plutos ability still puts the Item on the top of the deck if not your hand