How "charitable" do you think the richest 5% will be in "spreading the wealth"?

Obama plans on increasing taxes on 200k single earners and over, but not under. 1/3 of those earning 200k and under do not even pay taxes. Regardless, they will still receive a tax refund from the Obama administration. Isn't that forcing the the most charitable portion of the population to be more charitable? What if they decide to stop philanthropy in the US and take that elsewhere?