Because CLE is a great place to live and NYC is a great place to visit?
Can't say anything about CLE, never been there, but I have yet to find anywhere like Brooklyn, everything is accessible and available within comfortable walking distance or great public transportation, with abundant choices for shopping, schools, etc. etc.
And I doubt whether there's any place other than Crown Heights where one can look forward to having as many unknown guests as they can fit in to their house for the coming Shabbos and YomTov meals!