You are motivated to power up. And one way to power up is to buy STEEM, right?
Also any kind of subscription can motivate people to just buy the necessary SBD every month if they are not able to make necessary amount by writing/curating.
And anyway, when you get someone to buy SBD or STEEM and they give it to you, it only affects the price positively when you are not immediately going back to the exchange to sell it. So even services like SteemMonsters are not going to positively affect the price unless they keep what they earn on the blockchain, I think.
Posted using Steeve