Airfare did not just go up since the show.
It has always been a little pricey due the the high landing fees at Belize International Airport.
If you search around...you can find decent airfare thru the links provided on this message board or airfare consolidators.
(See Marty's post above)
I've got a lady coming first week of June that found airfare from LAX for $450 RT. thru a consolidator.
If you really want to voice an opinion that might accomplish something.....write a letter to the Belize govt. about the high landing fees. Send a copy also to the Belize Tourism Board.
Maybe if everybody started doing that....they may start realizing how much impact this airfare issue has on our tourism.
Be sure and quote details when you write...ie: prices, dates, airlines, etc.