I have very specific dragon pairs that I breed. By that I mean the dragons are following some identifiable, reasonably popular color/gene scheme. For instance, this girl:

Blue range/Magenta/Banana, IriShimCircuit are popular eyeburners. Her mate is identical to her, and all their babies are the same colors/genes/breed. They've been selling for 35-40k each.
Then there are these two:


Obsidian/Obsidian/Maize-Ice
Basic/Basic/Crackle
Their babies usually sell for 15-20k.
I'm awful at advertising and actively selling my dragons, though, I just stick them in the AH and hope they sell. xD;
From what I know, Imps and Coatls and maaaaybe Nocturnes are the best sellers. Crystal/Facet is still a super popular gene combo, especially in the blue ranges. Gembond seems to be the most popular tert gene to go with it. The newest genes, Vipera and Hypnotic, might also be good money makers.
For more about actually pricing and selling dragons, Nico and Satani are the ones to ask. o: Someone else here has a hatchery, but I forget whooooo (It might be on the front page, actually)