I recently had a bitter sweet experience where the conference organizers charged a hefty fees for speaking. They were already charging the attendees (quite a lot!). Although my employer was ready to pay for me, I thought it was not fair of them to charge external speakers.
What has your experience been? Do you approve/disapprove?
Traditionally (from my experience), speakers are invited or apply based on a topic and are not asked to pay any fees. The conference costs are covered by the conference attendees, sponsors and booth fees.