I think people learn more from success than from failure, but they learn more from failure than from doing nothing. Since typically your choice is between trying and not trying and not between succeeding and failing, your dominant strategy should be to try and let the cards fall where they may.

Aside from that, most of the people reading are in the "doing nothing" category (I'm largely in this category myself when it comes to startups, though I have tried and failed before), and so it behooves them to listen to the failures. :-)