Please could you spare a few minutes to check out: http://foobets.com and give me your honest opinion.
The basic idea is to allow a community of users to 'pitch' and 'bet' on predictions in tech, sport, politics etc.
The first few hundred folk to sign up get a free Pro Account, which I'm considering charging at $10 per year, but might give away free if I decide to ignore 37 Signals advice and follow PG's strategy to grow as quickly as possible.
There is nothing wrong with trying to make a buck. But the disparity of programmers' mindsets is amazing.