There is a perception(and it tends to be accurate) that if other people in the dart frog community don't think what you have are "advanced" level dart frogs you won't get any respect and will be looked down on. Beginners want to fit in, be accepted and be respected so they are often influenced by what gets the hype rather than picking what they would pick if they were not influenced by what others thought was more "difficult" or rare. They think if they have pums thumbs or what ever else happens to be "in" people will respect them more and that indeed is often the case.
thats not completely true. I know a couple froggers (not naming names) who only own "beginner frogs" are are HIGHLY respected in the community.