My boss has asked me in my last two performance appraisals what I enjoy about my job and each time, I say that having this job will make me 10 times wealthier in my personal life. I don't mean that I'm making a ridiculous salary. (Maybe someday...) I mean that looking at borrowers all day lets you see all kinds of slices of life — and hopefully learn from them. In the short time I've been at my job, I've seen all kinds of borrower financial statements: conservative borrowers and leveraged borrowers; those who got rich by investing in real estate and those who inherited money. Those who work for their parents' company and parents who work for their children. Here are some of the best lessons I've learned from working at a bank. Don't buy a house you can't afford. Don't buy two houses you can't afford. Don't roll your eyes at me; I know everyone is saying that in this economy. But I've seen people who have stuck their necks out even in this economy, thinking they could afford that jumbo...