With T206
A lot of raw collectors will bid up weak cards/beaters into nearly the SGC 40 range, which I always find a bit odd. Then you can often get a 50 for just a wee bit more than what a 40 would cost. Then there is usually a pretty decent gap to get to 60, because there are a lot of people that won't collect cards with creases, so they start at 60 -- and that's where the "hi grade collector" demand begins, so to speak.
In short, there are different price points at different levels of the grading structure, and you will sometimes see anomalies at the line between two grades based on this, and a variety of other factors that have already been mentioned in this thread (e.g., eye appeal, timing, auction publicity, etc.)
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