Here is what you aren't thinking of:
No one is voting for #26, 27, etc.
Let's say there is a top 30 that is voted on. Assume Team A got 50 points in votes 1-25 but not any in 25-30, while Team B got 40 votes for 1-25 and 12 points for votes 26-30. Team B would be #26 and Team A would be...