Now, a low credit score might just completely shut you out of a mortgage, so obviously that's a huge impact. But even the difference between a high and a low score, and I say low score, I still mean a qualifying score. So if you look at a 30-year mortgage, let's assume a million dollar home with a 20% down payment, you're having a $800,000 mortgage.

Now, I looked at a table of mortgage rates by FICO score, and they range from 620 to 639 at the bottom, gets a rate of 7.838 and 760 to 850 at the top is a rate of 7.242%. If you look at the total interest across the life of that loan, you would pay an extra $117,703 of interest just because your credit score was in