First, do not give up based on some dorks posting on a forum
It might happen, but if you were in Vegas placing bets you would likely never be on an indy writer to make it big. It DOES happen, and I hope it does happen for you (and me to while we are at it!)
I agree it would be cool to quite my day jobs and only be an author full time. As I have stated, I do have money motive too, I just do not expect to get rich. I do get a check (well 2 actually, 1 for UK, 1 for USA) from Amazon every month. You can make SOME money doing it. That seems fairly easy (since I am currently doing that).
I guess my point is that it is about setting realistic expectations. Want to make couple-few hundred extra a month? Sure! Go for it. That should be doable for most decent writers. Want to make $100k/year? Eh... I would not place my bets on that. It DOES happen, so nothing wrong with trying.
As for advice, I have posted my plan several times, and each time have been told it does not work, it sucks, its stupid, whatever. (I have to look for old posts but I am pretty sure you were among those who said my plan was bad.) So I have stopped mentioning it but I am continuing to follow it.