Bidding and buying a property without an appraisal on the property is not a logical step because this purchase without valuation will result in you buying without knowing the full value of the house and therefore you will likely be charged much more than it is worth. In a sense, you are considered scammed. Also, banks will refuse to give you a loan if you try to buy a property without valuing it. Because you can't prove how much a house you bought with a loan from the bank, they don't trust you and won't give you a loan.