I have actually mostly gotten this strategy from very dedicated teachers. It's meant to address a strategy clever and grade-seeking students work out very quick

I have actually mostly gotten this strategy from very dedicated teachers. It's meant to address a strategy clever and grade-seeking students work out very quickly: without something like this, constantly asking for regrades has zero cost, and occasionally benefit to you. This moves regrade requests more toward "No, I checked over my exam again and I'm sure this is a mistake..." rather than "Maybe I'll pick up another point or two..."