i care for me and for people i'm interested in, do something for me, or who i care enough about to care about - you'll know what i mean, if you do.
and that's to varying degrees.
but, like aeval, my default position is nothing, although i have more concern for myself. and yet, when i DO care for/about someone, it's total, and i'll move heaven and earth to make sure things are good for them. well, as long as it doesn't put me out, of course.