Limited Voting Rate
Each account is rate limited on how frequently it can vote in order to prevent automated scripts from having more effective power than manual voting. This rate limiting is implemented by dividing the voting weight over all votes by an account in a 24 hour period. Someone who votes for 100 posts a day will have each vote worth about 1% of their weight.
Encourage Distribution of Voting
Each account is only allowed to vote with up to 5% of its voting weight on any given post. To maximize its voting power, an account must vote for at least 20 items per day.