Why don't more people post their startup ideas on HN?
nostrademons: People used to - we used to get "review my startup" posts every couple days, and for the first few months people would actually get really good feedback on them.  Then more people started doing it, and the average startup became lamer and lamer, until eventually people just stopped reading & voting up "review my startup" posts.  Then people figured it just wasn't worth submitting them, so it sorta stopped, mostly.