The game is not necessarily rigged.
Some people find what they seek on the first try, wich is also statistically unlikely.
Spent 110 keys on a box that has a 1/6 chance of getting the shoulders I wanted and got everything else except the piece I need. To claim that these vendors aren’t rigged is laughable.
Now I gotta go through the painstaking process of grinding all 3 pledges on all of my toons every single day until I get lucky.