I think, ultimately, your interests govern the makeup of your collection.

Initially I was interested in a lot of different species and areas but the more I found out and kept them I gradually decided to cut back on the number of species simply because space is limited and ball pythons really were the ones I couldn't see past.

I still get my head turned by nice examples of other species at times but, realistically, I can only house one to be able to breed the morphs I want to own personally.