Open up the monied speeches of politicians

A common income from present and former political officeholders and leaders is giving speeches to groups in the private sector.  The amount for each speech varies by the politico; each one can run into the hundreds of thousands of dollars; fundraiser speeches by office candidates can run into the millions.

Is it ethical to "cash in" political value he may hold?  Should he be more egalitarian, and contract only minimal fees for his speeches?  How important to the general public-- those not attending the event-- are these speeches?

Times change, and so do the speeches.  There should be more transparency to these events; the public needs to know what these important people have to say.