I could ask a dozen questions like this, but the bottom line is that we as humans make dozens of irrational decisions a day—it's how we're wired. I encourage you to combat this natural inclination and start injecting intentional rationality into every decision you make.
You'll be surprised how replacing emotion with data in your decision making processes will positively affect your life. People will start to listen when you speak, at home and at work. I guarantee it.
That way, when the time comes for you to buy four pairs of shoes when you only need one, you can say to yourself, "You know, I've been super rational lately. I'm going to splurge."
What are some ways you've found to combat the natural human inclination toward irrationality?