I think what people forget is our WoL have to eat and rest so we need money to do that.
Makes sense to have quests and sidequests like that.
Also most people don't know we are the WoL, but even if they do, we need to eat. Lol
Plus, it makes people happy and trust us.
So my Kira is sure sometimes annoyed and say can you do it yourself? But after seeing people smile and happy and a good reward, it make my WoL smile too.