Talk:Game Updates/@comment-89.211.58.142-20130420032010/@comment-5951233-20130420175147

I think it is part of a balance they intentionaly created and keep to. Plant is the easiest and least profitable, being the first dragon you breed with the lowest grade habitat(s). Metal is the last you acquire, with an (at the time) expensive habitat that can hold the most dragon cash of the 8 elements. To keep the balance they allow no big money making dragons on these habitats. There was another factor, a difficult/costly to advance metal shrine, but this was mostly eliminated with the new gem system for shrines.