This my personal belief that ever since officers were removed from dispatching in the 70's or earlier dispatching has become a thankless underpaid dare I say profession? I tried it back in the late 90's when my radio repair bussiness was being impacted by cellular and NextHell, and as someone else said you would be better paid at Walmart.
I know that in the 70's at least in Westchester County a dispatcher must be an officer, something about a civilian telling a Police Officer what to do. In Yonkers and other agencies I know of which had civilian dispatchers there was also a Police officer present at all times to meet that (law?) qualifications.
Going back to NYC Bloomburg really screwed with civilian positions money wise, new FD and PD recruits getting paid less than 20K a year! He even had the gall to say let them live at home with their parents!
Looking at the requirements you would be better paid elsewhere.