Reefarama...I like that!
I've talked to a couple of different people who make the reefkeeping speaker circuit and was told they do appreciate good lodgings (nothing over the top), meals, airfare of course, and that an honorarium for speaking of anywhere from $100-300 is also in order.
These speakers don't get rich by doing this; most do it because they enjoy it. Even those that may be promoting a book are certainly not raking in the dough. Production and printing costs are high and the books don't have a huge market.
Alice