I think the author of the OP is trying to understand the purpose of the rule, not strategizing about how he can use it. It’s a “Why would anyone ever want to do that?” sort of question.
The answer is generally that it is extremely rare that such a strategy would be a good idea for a team, but just in case it happens to be one of those rare situations, that tactic is outlawed, because it would be a kind of scummy thing to do. Here’s another situation where it could be to a team’s advantage to throw a ranking point.
Team 9746 is in first place, with a three point lead, going into the last qualifying match. Team 9234 is in second place. Team 9087 is in third place, one point behind team 9234. Team 9746 and team 9087 (the 1st and 3rd place teams), are “friends”. i.e. they’ve worked together before. Their coaches know each other. They have complementary robots…whatever. They have met and agreed that if team 9746 has the opportunity to pick team 9087, they will do so.
In the last match, team 9234 and team 9807 are on the same alliance. A glance at the score sheet indicates that if team 9234 scores three points, they will be tied with the first place team and the tiebreakers wil fall to 9234, making them the number 1 seed, dropping 9746 into second place. At that point, team 9234 could pick the third place team and those teams, who had agreed to ally with each other if possible, could not be on an alliance together. (Because a team who declines an invitation cannot accept a later invitation. They can only form their own alliance.) So, it is in the best interest of team 9087 (the current third place team), to score two points by winning the match, but to not score any bonus ranking points.
Such a tactic would be considered unethical, so it is prohibited.