Oh, hey, something we agree on.
One of my berserk buttons is gloating about the first post. There is NO reason to gloat about it. It’s not special, and it, like any other post made here, can be deleted at any time. If that happens, your “reason” to gloat disappears.
As for other numbers…
If a post were a person with it post number being its age in years, this post (18th) could vote, smoke, and drink in some countries. I don’t see people gloat about it though.
A round number like a power of ten makes a bit of sense, but 10 itself isn’t a real milestone. Not to mention, if posts get deleted, it’s not even accurate anymore.