Only out of resentment towards people who earn higher incomes than themselves. Once they make it, they won't. Generally these people are between 100k and the very top bracket.
Given they are one of the driving forces opposing inner city development (of almost all kinds - road, rail, housing) while favouring the most liberal of immigration laws, I can't view them as anything less than cynically self-interested.
So, I've voted Greens a few times and actively support these things around here.