I doubt people are likely to want 8 re-rolls, but it is nice that if you get an extra re-roll (from cheering fans or something) with just a couple of turns left you're more likely to be able to use it.
Having seen a picture on FB, it looks like GW really screwed up some of the rules here though. It says that in the second half you replenish your used re-rolls, but don't get to carry unused ones over from the first half. So, if you start the game with 4 re-rolls and use 3 during the first half then - RAW - it seems you start the second half with 3.
Having seen a picture on FB, it looks like GW really screwed up some of the rules here though. It says that in the second half you replenish your used re-rolls, but don't get to carry unused ones over from the first half. So, if you start the game with 4 re-rolls and use 3 during the first half then - RAW - it seems you start the second half with 3.