It's kind of weird that they want their comment to be at the top, but the only thing they say in their comment is that they want it to be at the top. You'd think if they were looking for exposure, they'd use the exposure to do something other than talking about how they wanted exposure.
I think the First Post meme has a bit of orthogonal justification to it, though: that if you spend the time to write something other than "first post," someone else will have beaten you to posting by writing less.
I didn't even know that was ALLOWED on Hacker News! All this time I've been going back to SlashDot when I needed to post that, and I could have been claiming first posts here.