The financial institution requires you to that inputs a appraisal, since it is mandatory if you want to apply for a mortgage loan.
Because you have doubts about the price of a property and want an expert to help you. Thus you will have arguments before a possible negotiation. If you are the seller, pricing you order on reasonable offer price to achieve a quick sale of the property.
It is necessary to value the assets in a situation of Division of inheritance or a settlement of community property