My johnny cupcakes Tee doesn't have a number showing whch it is in the run of limited editions....
Also if you are getting say a 4 or 5 colour print made the screen prices will be alot so a run of say 100 shirts wouldn't be enough to make a substantial profit (suppose it is all relative to design set up costs). So i would personally make the limited editions runs bigger. All depends upon demand.....make enough to make money but not too many to loose customer desire
I mean i am not an expert but Johnny cupcakes had made millions so i presume he has sold millins of shirts but he has not used millions of designs.