By what definition of "too much"? I see nothing wrong with focusing on studying the best--the ones that made it. Those are the people to emulate. Why spend your limited time studying the ones that failed? Sure, learning from mistakes is great. But I suspect I'm going to weather the storm better if I learn about mistakes from people who made it through to the other side--rather than from people who blew it and ended up bankrupt. I really don't think I'd like to be facing a problem and thinking, "Oh, wait, I read about this...it turned out horribly...we're dead!" Much better to think, "Well, Evan Williams had exactly this problem with Blogger. And look how that turned out! Just gotta keep plugging away."
Just a thought. I don't really think we need a lot of post-mortems while we're in the early stages. Maybe later when we have a huge success on our hands and want to know how to avoid becoming the next SGI (Google uses SGI internally to mean, "company that has huge success and then made huge mistakes", because Google has actually moved into nearly all of the old SGI buildings in Mountain View as SGI has atrophied into a shell of itself--seeing how business and management heavy Google has become in the past year makes me think they didn't think hard enough about SGI...).