If it's an AS332L then its probably due to fuel, we give the client max payload after taking into account all the fuel we need and that only leaves a very small margin for error. We add fuel for taxi and sometimes on a busy morning the normal taxi fuel isn't enough. It can be a bit of a gamble sometimes as if we take too much fuel for taxi and have no delays we are then overweight for take off and have to burn it off, done that twice now and had to taxi to W 1 and 5 on different days. The flip side which you are probably thinking of, is if we don't have sufficient to hold for too an extended period of time then we need to know so we can taxi back into dispersal, remove our pax and refuel.
We might seem like a funny bunch (helicopter pilots), and some like me have no idea about stuck wing ops, but we are merely trying to operate efficiently.
Hope that helps