Every tool we use is, essentially, designed for productivity. Maybe, everything we create with a tool is just a byproduct of the desire to be productive? At times, that's exactly how I feel. Productivity is satisfying. For a creative person with lots of ideas, a pencil and notebook is a perfect set of productivity tools. The format is eternally compatible, no need to upgrade. There will always be new ways to be productive and it seems like the better ones cost more. That feels unfair if your creativity isn't generating any income. YES, it is important to invest in your ideas. Meaning, you need to spend something. That something can be time, comfort, luxury, etc. Just remember, money isn't your only commodity. The question is: What are YOUR ideas worth to you?