I've counted, that if i wanted to get my BS the PvP 10 gear i would need 5.500 bori tokens. That's kind of what got me bored of my BS. PvP 10, done 4k minis, 25k kills, 50+ sieges... and couldn't get the gear because i didn't dig like a maniac and boxes looting tokens didn't exist at the time.
On more recent characters it's less of an issue because you can start stacking Bori tokens since PvP 0. Yet it's true there is a big diffrence in the amount of tokens you collect via those boxes depending on what class you play. Out of three PvP 5 classes, without bori (HoX, Necro, Barb), while my barb and HoX have around the same amount of tokens (~700) my necro has half that amount.
Sucks...