I think they just mean, if you have 10,000 customers, it's not surprising if someone hits the 1 in 10,000 odds. You could say that person was "lucky", though they have no greater chance than anyone else of hitting those odds again.
They don't give us enough info to say for sure, but something tells me Hufflepuffs winnings were a few orders of magnitude less likely than one in 10,000.
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I think they just mean, if you have 10,000 customers, it's not surprising if someone hits the 1 in 10,000 odds. You could say that person was "lucky", though they have no greater chance than anyone else of hitting those odds again.
They don't give us enough info to say for sure, but something tells me Hufflepuffs winnings were a few orders of magnitude less likely than one in 10,000.