My email pinged last week with a notification: “40% off ends in 3 hours.” Thankfully, I've unsubscribed from these kind of emails... but the odd one still sneaks through sometimes. Old me would have opened it in a millisecond. Just take a look, it doesn’t hurt to look, what if I miss something good. But this time I looked at it and felt… nothing. I unsubscribed and went on with my work day. That got my thinking about the years I spent living in self-denial about my shopping habits. How many...