I voted "Yes," but there is a cavat.
I let the XP cost be payed by anyone. Thus, the magic item creator need not necessarily expend his XP to create the item, and IMC, the magic item cost reflects the XP investment being split evenly between the caster and the customers or patrons. If the XP investment is fully borne by the caster, then the GP cost rises. If its fully borne by the customer, the price drops.
I let the XP cost be payed by anyone. Thus, the magic item creator need not necessarily expend his XP to create the item, and IMC, the magic item cost reflects the XP investment being split evenly between the caster and the customers or patrons. If the XP investment is fully borne by the caster, then the GP cost rises. If its fully borne by the customer, the price drops.