I need to start selling again

The Starbucks by my office rotates their artwork every few months. This month they are featuring a series of paintings by artist that are mostly paintings of trees with crisp, vibrant and sharp colours, yet are very simple. It's the kind of work that I find very appealing.

I was considering buying one until I saw the price. Am I being cheap and/or naive, or is $150 for a 5"x5" painting a little much?