It depends really. If I contacted them about an ad for an internship or something along those lines, Then I wouldnt mind working for an internship for a bit. I couldnt do this for long, as I have figured internships are generally trial periods as well. so maybe 3 to 6 months tops, thats assuming though also I have no life and expenses, which is not the case anymore. So I wouldnt.
But also, if they contacted me.... then as was said before, they have seen my work, all 1 piece of it, and thought I was good enough but want to try to get around paying me. Stick it to them and turn them down and go back to negotiations and try to get some pay