I answered based on my current personal salary (not factoring in my partner's income), so currently, I'm in the $50k range and will be making significantly more than that when I start teaching a couple of courses after Christmas. However, I only returned to working full time quite recently after spending the last few years in grad school living on my scholarship and my savings. Despite that, I've managed to eat primal/paleo for a couple of years now. We eat a lot of local, seasonal food and buy our meat and eggs direct from the farmer in bulk. We also eat out far less often than we did before, which saves quite a bit of money, as does cooking from scratch and watching for deals.
I am also white but do not live in the US.