I would really like to know, if you would not mind explaining, how are we all egotists. I believe myself that HN tends to attract better-than-average, educated, ambitious people. Egotism goes a bit with that. But to all being like that.

What you have just said is exactly egotism. From wikipedia: "Egotism is the motivation to maintain and enhance favorable views of self."

and also:

"Various forms of "empirical egoism" can be consistent with egotism, as long as the value of one's own self-benefit is entirely individual."

It just comes out in the difficult situations like doing a startup (in a war, etc).

That particular thread shows how people fight to remain egotists. Seems like me alone do not care about favorable view of myself (think karma)

I upvoted your initial statement and this one, but not the one in between. We're not downvoting you to "hide the truth", we're downvoting you because your statement wasn't making an interesting argument. Now you've started to argue what you mean, but you're still not being particularly informative about it.