People keep buying them because they don't realize they are crap. We probably have another few years of this until the people with disposable money get tired of the crap phones.
I can't imagine their resale value is very good either. The screens are plastic (they have to be to bend), which means they scratch incredibly easily. Though, I guess that is a good thing if you want to try a scratched-to-hell one that somehow got a tiny bit of dirt in the joint.