But what difference does it make if its a mystery box or a single issue?
the difference is a mystery box is tougher to validate.
Scenario 1:
User A buys Action 1 from User B
User A ends up with the stated book, User B ends up with correct ammount of $$$.
Pretty straight forward. Issues might be around non-disclosed restoration, or grading disagreements, which can be raised, and dealt with.
Scenario 2:
User A buys one of 20 mystery boxes from User B who stated that one box would contain a Saga #1 RRP, the rest would be Image books worth $50 or so.
User B keeps the RRP and doesnt put it in any of the 20 boxes.
User A gets his books(no RRP) and assumes he didn't "win" the RRP, but the other 19 buyers also make the same assumption.
How does this get checked? All it takes is 1 buyer to not reveal his mystery box contents for the