So every participant would have to read information accumulated in previous steps? That's your overhead right there. If so many users access your information -

So every participant would have to read information accumulated in previous steps? That's your overhead right there. If so many users access your information - how do you know who leaked your sensitive data? Outsourcing such small pieces could make sense only to the web site itself (which is fast, cheap, secure and reliable) - not to external human players. Traditionally humans tend to manage computers, not the other way around.