What is the value of a good credit score if the person is so financially independent (AKA wealthy) to the extent of not ever needing to borrow money again in the form of a mortgage, car loan or credit card? E.g., ethical reasons notwithstanding, if one won a few million dollars in lottery and owed a couple hundred thousand in unsecured debt, what are the incentives to that person to actually pay off his/her debt as opposed to just walking away from it and relying on the cash (s)he has for the future spending needs as opposed to borrowing?

The only thing I can think of is that phone service providers ask for credit report when you want to start a new account but I am sure that could be worked around if you just put down a cash deposit in some cases.