Who said intelligent and educated people don't vote for Shiv Sena. Vile Parle has a very high educated class and it is a Sena stronghold.
And for that matter, ghati types (what u call gutter class) are present in every state be it West Bengal, UP, MP, or the South. It is not that these states have only creamy layers & educated classes, in fact they are much much worse.
It is just that since everyone seems to converge on in Mumbai and so focus on the people staying here and think that all Marathis are ghatis like the servants these people employ.