I can only tell you how my Travel Agent does things. She doesn't like the $25.00 fee , but her agency (the "boss" ) requires that she add it to the price of a cruise. After our first completed booking with her, she's taken the fee off all of our other bookings at final payment. (I suspect she's taking it out of her commision.)
As long as they are upfront about it, I don't have a problem with a TA charging a small fee.
"A truly happy person is one who can enjoy the scenery on a detour."
Golden Princess 2009 Carnival Conquest 2010
Grand Princess 2010 Island Princess 2011
Grand Princess 2011 Carnival Magic 2012
Carnival Dream 2012 Island Princess 2013
Carnival Magic 2013 Carnival Legend 2014
Carnival Magic 2015 Coral Princess 2015