I'm not sure which angle this list is taking. If you are writing about the most expensive dive locations from your opinion, some of these are right but not all. Many of the best dive deals I've found are for the Caribbean and Hawaii. And expensive locations are expensive for a reason - you get more out of a single dive in Galapagos, Belize or in Roatan than you do out of 10 dives in your local quarry. Certain Caribbean islands are wildly cheap, and countries in Central America sitting on the Caribbean sea even more so.
To put places on your "don't dive list" that are the largest and healthiest barrier reefs in the world (Meso-American - Belize, Honduras, etc. and Great Barrier) is bizarre to me - even from a strictly value perspective, you see more, experience more, and can go to more diverse dive sites in on trip in these locations due to the nature of the reefs and creatures. Also, Galapagos? Yes, it is expensive. But you cannot see the same things in the Cocos Islands or any other location for that matter that you can see in Galapagos - that's one of the many things that makes it so scientifically significant, is that there are creatures that have adapted to behaviors specific to these islands and no where else, and creatures that exist no where else in the world.
I think it's a fine idea to suggest places where you may not be getting the best value for your dollar, or even dive sites that are over rated, but to pick places with the most diverse creatures, healthy reefs and unique animal behavior and siting opportunities probably isn't the best way to approach it.
I'd be very interested to see your places TO dive list.
---------- Post added September 16th, 2013 at 12:20 PM ----------
Also - in response to the Thailand vs Belize "discussion," let's consider that from the east coast, you can go to Belize more often and easier, and get more diving days in. You cannot feasibly go to Thailand for 5 days, and lose more time to air travel than you would to Belize. One poster mentioned this - and it is another reason many have go to Belize before Thailand. If I have a long weekend to five days to go on a dive trip, going to Thailand wouldn't cross my mind. The Caribbean would because it's a) closer, b) cheaper flights, c) cheap dive lodges, d) beautiful, healthy reefs with plenty of diversity, e) quality dive operations, f) more diving time (due to losing about two days traveling to Thailand on the VERY, very short side, and that means more expensive flights), etc. etc.