It isn't that popular because who would want to pay about $10 monthly to be successful on there. Also, most of the people on the iDevice version of the game don't even know that there is even a PC version. That is why most of the people that are mainly iDevice users cry over not getting the PR job because they either lie about knowing about RC, or they say that they don't know how to use the RC because they don't have a clue about what it is. They just presume that if you say the PC version of Era, they are thinking Facebook Era. Also, who would want to start all over knowing everything about the iDevice version, and thinking that the same rules that apply on iEra apply to the PC version.
So, this situation is not because people don't like it, it is just they don't know about it.