People are not trading their words merely for cash, they are trading also their financial history and respect. So beyond those words they can lose additional assets and have a blown credit history. This is worth more than words. If it was only that banks would not lend, they would ensure you had more, like collateral or 20% down so that they don't take a hit. Hey, that is a novel idea
As a lender myself, any borrower who defaults automatically goes into the shitcan, this not only affects that borrower, but also ALL borrowers, as now the lender knows that you can't depend on common statistics to determine the actual ability of a borrower to pay, but you now must suspect ALL borrowers, since default now does not depend on if the borrower CAN pay, but if the borrower WILL pay.
This is the fundamental breakdown in logic for strategic borrower supporters. Pricing of all lending is based upon measurable risk on common statistics. Most of those statistics are measured by FICO scores and income. However, if you add in just general risk of default form people who will do so because they just don't feel like honoring a contract anymore, those costs are distributed across ALL of society, since you can't narrow down WHAT THE PROFILE OF A DEFAULTER IS.
This is why contracts have more than a legal relationship but also a moral one. If you lend money to your friend, you do it because you know him. If you thought he was going to fuck you, or if you didn't know he WOULDN'T fuck you, then you wouldn't lend, or you would increase the interest rate for compensation of the risk. This not only affects that one friend, but all friends.
Modelworks. You're actually increasing the risk in lending, in that by rewarding people with higher balances, you're actually allowing those who may not pay in the future gather more money, and more risk. This does not work on a portfolio basis as you'll get a negative bias in those who ultimately cannot pay in the end (especially if they accumulate more debt than they can pay for).
The correlation between FICO scores and default rates is VERY high. I know this because I worked for a 3bn consumer loan lender. I analyzed almost 1M loans over 10 years, creating annual and quarterly originated pools. I then tracked those pools over their lives (static pool default curves).
I then stratified those loans by FICO score, term, whether it was a refinancing/upgrade or new origination...etc. The FICO score stratifications were striking. Obligors who had FICO scores of 700+ defaulted maybe 1/10th as much as those with a FICO below 600, banded.
Sure, there is a negative bias with FICO scores, but do keep in mind that FICO scores will eventually raise with payment history, allowing lower rates, lower debt service, and, as a result, higher loan balances, which is your end-goal anyway.