As a user with less than 500 SP, you vote every time with 100% voting strength. Every vote takes away about 2% of your voting power. With more votes, your votes become less and less valuable. That's how they are connected. If you can adjust your voting strength, you will use less voting power.
As a normal user posting on dMania, those changes don't have to bother you. Those changes are only for supporters who want to take part in the curation process.
If you want to get authorized and be part of the curation process here is the easy explanation: Vote fair and don't vote too much. That's it.
Some users wanted to see the metrics behind the system. Normally I would hide stuff like that to keep everything easy and simple.