its the optics, they are just really nice and fancy and there are so many different morphs to choose from.

but what also plays into it is that these morphs are guaranteed to be captive bred.

i mean you see it in all pets that are above a certain critical mass. it just happens when enough people keep and breed something, and its most extreme with the most frequently kept pets.

just for the beauty, check some high-end discus morphs: http://www.diskuszucht-stendker.de/g...s,index,0.html just ridiculously beutiful. with iridescence and opalescence and a high amount of traits and morphs, quite comparable to BPs 10 morphs are just more interesting than 10 normals.

so, really, it just looks better and keeps things interesting