Let's look at the definition of appreciation: "to raise in value or price, especially over time." When you put your money into stocks, you want them to appreciate or grow. So when you appreciate something in your life you are giving it the energy that allows it to expand. By merely using that word you are not only expressing gratitude, you are also defining that you want this item or situation to grow, which makes your statement stronger and pushes your intention into the future.
When you change your language, you change your life.
I appreciate you,