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This is important to many readers of hacker news, as not everybody who is a hacker is a man (I am a woman who is also a hacker, for example, and I use a lot of exclamation marks in my writing, so, I found it interesting that this is noted by someone else, so I'm personally glad it's on the front page).
I'm assuming you're asking genuinely, so this is a genuine attempt to explain :)
I'm split on that, as it made me check the README I'm rewriting, and compare it to the previous version. After noticing an increase in the amount of exclamation points and enthusiasm, I think I may decide to rewrite it again, to cut down on the enthusiasm.
Besides being an obvious waste of time, why should tech be boring?
I don't want it boring! I want my vim and my xterm to be cute!