Some spending we do out of habit. The thing we buy may have stopped bringing us value a long time ago, but we still do buy it.
An example is the daily, or triple-daily or more, habit of purchasing coffee. Many ads tout how affordable their products are by saying that you can own it for "less than price of a cup of coffee a day." So, we go out and buy the product thinking that instead of buying coffee everyday, we'll just spend our coffee money on this. In reality, we spend on both.
When we do go for coffee, we are usually looking for a hot beverage to warm us up as the A/C in the office is cranking, or as a caffeine jolt. It adds up quickly.
A valuable habit is to make your own coffee or tea at your desk. A $20 insulated carafe, an $8 tea kettle, and a $2 box of tea will pay for themselves in less than a month. Even if you still go for coffee, you'll do so out of active choice and not passive habit.
