Because the first stakeholder does not "pay" a post, they vote for rewards. The votes (both for and against rewards) are added up AT THE END, and then rewards, if any, are paid.
If someone wants to "pay" a post, we have a transfer function, and I think some UIs have a tip function too. That's paying. Voting is voting.
Ah. I just wanted to clarify this again because I've seen the phrase "stakeholders pay for rewards" thrown around multiple times.
They (we) pay for rewards collectively, not individually. We vote individually.