if I’m selling a Rolex and I say it’s worth $40,000 and you agree that it’s worth $40,000, and you buy it, they call that buyer beware. Also, if you are a store selling fake Rolex’s, you are selling to the general public.
However, this isn’t a sale of a product, it’s a loan where the principle will be repaid, the only variable circumstance is the amount of collateral and interest rate that will be charged. If the lender agree with your valuation and agrees with the risk, then they know what’s at stake. This is a transaction between a bank and one person. If the bank accepts the risk, and are happy with the outcome, then harm isn’t proven.