Does the submitter have a script that automatically posts new essays from paulgraham.com? You've submitted the last three in a row almost instantly. Not that I'm criticising; just curious :-).
And when an article has 10 upvotes in the first few minutes, it's almost guaranteed to make the top spot on the front page, and therefore gain even more votes from real users due to the publicity and feel that others have found the article interesting.
I was top 15 and wanted to get invited to Startup School again, so I didn't make the script. But since then, users have come out of nowhere to reach the top ten, accumulating karma at a dizzying pace.
One of the top users has said he submits the best stories from his rss reader every day. I believe a more likely explanation is that all stories from sites that are commonly referenced on the front page are auto-submitted by a script that checks for new articles every few minutes.
This was also my explanation on why so many techcrunch stories have been upvoted on news.yc--they make an easy candidate for auto-submitting: not because of story content, unfortunately, but because auto-submitting stories from sites that already appear often and that other auto-submitters might submit gives one a free set of 4-10 votes each time.
I guess my point is that Hacker News is being gamed the way reddit and digg are.