I can see the merits of that. But, there would need to be other limits. Namely, if you are the Zenith talking to the Skylaxians and want to know how to talk to the Krolin, then the Skylaxians should already know how to talk to them, and can only help you up to that point. Hope that made sense! Maybe it should be a one-time giant payment, since they would probably just hand us a complete dictionary or something.