Probably because the security is specific real property, so that someone can't give everyone a $100k/week raise and then declare bankruptcy and use the court ag

Probably because the security is specific real property, so that someone can't give everyone a $100k/week raise and then declare bankruptcy and use the court against the secured creditor. If this were not the case then it would be hard to convince someone to lend for the various bits of real property that make commerce work. Secured creditors are taking on a risk, but not a very big risk because they have first claim on the secured property.