I did judo as a child. At first it was because my parents thought I'd develop physical self-confidence that way. It worked (and judo's something I'd recommend to any boy), but it doesn't take much training before you can win fights against most people. After that you stay interested because you want to beat other people at judo, just like any other sport.

So you might sell your rationality dojos as being about winning arguments, but pretty soon I imagine that the practitioners might get more interested in being right.

Most people will get very competitive the minute they've got something they can measure. Is there any form of transport which isn't raced? And most non-competitive people will get very competitive the moment they're in a fight they can win.

Suddenly I'm imagining a room where the sensei is describing the Amanda Knox case, and the students are asking him questions and debating with each other, and after all the talking is done, people place and take bets on the result at various odds, and then the sensei reveals the actual answer and the correct reasoning. And ranking points are transferred accordingly, and there is a ladder on the wall where names are listed in order with the scores.

I already reckon I could seriously enjoy such a game. Who wants to play?