It is a 1/3 chance of increased XP for each ++ vote, until the value of the node goes over $NORM, which has been pretty stable recently in the 10 range. Then it goes to 50/50. And the chances get better as you go up farther. Voting/Experience System
I imagine you've just been "lucky". 1/3 chances aren't bad at all. My last node that got to 12 netted me about 6 xps (might have been slightly more or less because I don't know if I got the 2 point "login bonus"), where the expected value would have been 9/3 + 3/2 = 4 1/2, so at least here it seems pretty much inline. I've had 4-5 rep nodes that netted me no XPs as well.
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