Celia irritates me to no end. Every time that dumb little sylph opens her mouth, I just want Haley to punch her.
Celia's a lawyer. So...is it even a "legally binding" agreement to half of Hlaey's earnings if Haley never agreed to the deal herself? Can you actually do something like that? Without a given person's consent or at least some signature giving the deal-maker legal right to speak for her? I really hope not...
Also, as I recall, most of the wealth she has gained she has also lost - such as at the inn fire when they were captured by Miko. Does half of the lost wealth also count towards this penalty payment? If so, she could lose everything - or nearly so - that she has saved up since leaving the Guild.