I always wanted to do something like this to attach real currency to an email request using HelpShare. However, when I read this product description this really sounds like a solution in search of a problem.
Attent™ with Serios™ is an enterprise productivity application inspired by multiplayer online games. It tackles the problem of information overload in corporate email using psychological and economic principles from successful games. Attent creates a synthetic economy with a currency (Serios) that enables users to attach value to an outgoing email to signal importance.