Umm there is something else - most of the crooks in Batman seem to be burning some midnight oil studying and practicing - right down to the ordinary mobster level.
So a real Batman in real world, where criminals are not all competent in many fields (except crime OFC - at least when Batman is around) could get by with lots lower skills.
Also a lot of skills overlap... Take this guy for instance (http://www.youtube.com/watch?v=QnClWxkcS4g) I guess that he has quite some of necessary skills to be a batman. Come to think of it - MOSSAD operatives probably are quite a representation of actual "batmen" - with tech and all :).
So a real Batman in real world, where criminals are not all competent in many fields (except crime OFC - at least when Batman is around) could get by with lots lower skills.
Also a lot of skills overlap... Take this guy for instance (http://www.youtube.com/watch?v=QnClWxkcS4g) I guess that he has quite some of necessary skills to be a batman. Come to think of it - MOSSAD operatives probably are quite a representation of actual "batmen" - with tech and all :).