Votes by members and high level player count more than low level non-members. This helps ensure that players can’t use alts to artificially increase their votes. This also gives another benefit to being high level, as every level you gain increases the amount of voting power you have, and there’s no limit. You are expected to only vote on any given post/thread once. People that abuse the voting system will find their voting rights revoked.
Not only levels that matters.