"Our need for self-expression manifests itself in our need for reading, listening, talking, feeling, etc. They play such an important role in our lives. If STEEMIT uses this human trait as fuel, I believe it will be a fuel that will never burn out. As people are inherently diverse, made up of unique values and opinions, that we will always have the need to express/exchange something from ourselves."
I like this part the best. It's an argument I haven't heard so far. I think you're right that Steemit makes use of people's desire to express themselves. I'm not sure about the price increases though. I prefer not to make predictions, and just enjoy and support the platform.