Looking myself for all month the prices seem to range from 60-120€ between Paris and Munich by train. Besides, wouldn't one expect the prices to eventually drop as the service is improved and sped up?

OTOH, I have a €9 ticket for all public transit nationwide this month except the long distance routes, and my cheapest flight was one way from Berlin to London Gatwick for either £9.99 or €9.99 (I can't remember which).