There's no need to be nasty and sarcastic.
Let me restate. It is, in my opinion, possible that Google Finance is in a position like that of Google News and thus generates no revenue. Have you considered this possibility? Do you think it might affect the willingness of people to work on a product? If I'm utterly wrong, I would love to know so that I can avoid being wrong this way in the future.
You tend to do this a lot and it does come off as very sarcastic, mocking, and/or un-genuine. As in, like, every sixth comment you leave.
Usually, you say something like : "You're right!" or "You're totally correct!" and then you exaggerate the point the person was trying to make, so much so that it comes off as mocking the comment and the person.
If you are mocking them, stop. It doesn't add anything to the conversation.
You are a pretty quick and sharp person, and you make a lot of very good points. So that's why I'm leaving this comment at all. You may just not realize that this is what you are doing.
I'm hoping that you just haven't seen that your style of commenting is coming across very badly.
But if you are trying to do this on purpose, stop it.
I have seen it go over badly. I've also seen it go over very well. The running total so far seems to favor the latter.
I'm working mainly from Dale Carnegie. The core thesis is this: never tell someone that they're wrong. Instead, start by finding a way to tell them how right they are on a point you genuinely agree with. Once you've satisfied someone's ego, it becomes possible to engage with their intellect. This can be tricky, especially when someone's main point is something you disagree with.
I sincerely doubt that "What if all your stated assumptions are wrong?" would have been well-received. That's exactly the kind of comment that tends to get a defensive response rather a thoughtful one.
My apology was genuine. I had no reason to be nasty, mocking, or sarcastic to this person. I was hoping that they might be willing to re-examine their stated assumptions. I failed to sufficiently hedge against a sarcastic reading. Which is admittedly a difficult task in a text-based medium centered mainly around a language and culture that uses sarcasm heavily. I've yet to find a way to reliably do this.
I do appreciate your feedback. It's a work in progress.