I voted for my own answer, and I got a message saying I can't do that. So I tried again, but this time navigated away before the message popped up... and now it seems I got 10+ rep for that vote.
If I navigate back to the page later, it appears to remove the vote and reduce my rep count.
The question is here: What is the PS3 Jailbreak?
I don't intend to repeat the exercise... and I will go back and remove the vote later, but I've left as is for now to demonstrate.