People are lazy. They don't pick the right categories while submitting and if I don't have it that way, then will add to the top category rather than the appropriate subcategory.

Here is how: when one is done submitting a listing, they get the add_success page. In that page if I have the hopto menu, they can select another category, and it will be a bit easier for them rather than going back to the home page. However, they still might not select the proper category but it will be a bit easier.