Perhaps they sacrifice something with stun counters or their +1/+1 counter-pumped creature gets removed, each of these situations results in treasure for you, so it absolutely feels like you're stealing
For example, Annihilate will be card advantage if it resolves normally targeting a creature an opponent controlsyou lose one card from your hand but you also draw a card, for a net gain of zero cards, and your opponent loses one card, so you're up one card relative to them
For collectors, the value equation extends beyond pure card prices the opening experience of a High Class Pack with guaranteed shiny cards, the chance at a god pack, and the display-worthy artwork make the cost worthwhile as an entertainment purchase
This item can be shipped worldwide.
Of course, you also have limits as to how many trades you can do at once and some cards must still be pulled