I probably should have mentioned this in the text. I previously had an issue somewhat close to this one. Someone published an app named "<appname> - <some keywords>" while I already had published "<appname>". I emailed Apple and they just told me they had let the developer know about it. I never heard from the developer nor Apple again.
Ah, the old "You're not our friend so its not our problem". While I do not have any ideas on how to deal with it outside of emailing them, the least I would do is make a disclaimer in your app's listing stating clearly that you are in no way affiliated with this "Pro" version if you haven't already. Better to save a few of those potential customers then lose them to the person who ripped you off. As far as getting the listing removed.. I'll leave that up to the powerful HN mind.
