You may have noticed over the past few weeks in beta if you had less than ~500 SP you did not earn any curation rewards. You also notice by design steemit does not give you the slider "Power Bar" for voting until this point either. This is for a reason and we now adhere to it.
Starting now if you do not have over 500 SP all your votes will be cast at 100% power. This will ensure you receive curation rewards.
Technical
For those interested in the tech. Steemit calculates your rewards based on "Vests". When they consider your reward too small their algorithm rounds it down to 0, considering what they call "Dust". By forcing all Shadow Casters with less than 500 SP to always vote with 100% power, their rewards will no longer be rounded down!
In conclusion, more earnings for all! Happy steeming!