Hahaha...It's not a must we make a thread about our first Bitcoin on BTCt unless we want to show off or attract attention for merits. In my cryptocurrency journey so far, what've learned that is also crucial to Bitcoin itself is privacy, even if you do not want to anonymize it, privacy is important. For instance, this is the way I view it, if I deposited $500 in my newly opened bank account, why should I be broadcasting it? If others will show off, I don't think it is wise for security and privacy concerns. So not doing it at that time even saved you as far as I am concerned because the less people know about you, the better when it comes to money.
I agree with you on what you said but some people don't really know how to keep such achievement to themselves and I believe that since nobody knows who is who on this Forum just username, that's why the OP decided to make it look like a public announcement which it is.
Fine is good to share good news but the way we take it sometimes is not how is suppose to be.
To be frank with you, I too would like to get my first BTC and start up something as the OP did, is everyone's dream especially those who are new in Bitcointalk to get their first BTC but not everyone would make a public announcement about it, safety first.
Your points are good and I always try my best not to judge all people the same way, but you know what, most of these things are not real, it's just that they do this for a main purpose, there are many of them, it's never new. I didn't give such a thought in the first place and I only tried to remind you of the core purpose of Bitcoin itself from the onset, not the way people are turning it to be these days. "Safety/privacy" first.
This is why I see it mostly out of maturity (if real) seeing people showing off the amount of Bitcoin they've purchased here, why? Also, one thing that is peculiar to the people who do this is that a lot of people give them merit for it. They now follow suit, which is the only reason I believe they broadcast this kind of private transaction, nothing else.
Nonetheless, it is a very good avenue to help one's alt grow fast.