I think we just have different definitions of "business plan". My 2-10 hour and often single page 'business plans' involve diving head-first into the market an

I think we just have different definitions of "business plan". My 2-10 hour and often single page 'business plans' involve diving head-first into the market and finding out who I'm going to sell to, how many there are of them, what competitors I have, what the ad rates are, etc. With this basic info I can take a grounded and unbiased look into the validity of the concept. You can have the best idea in the world, but if there isn't a market for it, there's not much point in pursuing it if your goals are financially driven. "Build it and they will come" and "Build something you'd want yourself" both aren't good enough reasons alone to sink any amount of time into an idea.