Not the only criteria, but the most important cost factor together with favourable local tax laws. Why do you think corporations like Dell and others invested so heavily in Ireland? Because they loved the country? Same answer for Poland...
You are forgetting that first of all, someone has to be able/skilled enough to do the job. As cheap as the labor can be, if they not go to skools, have diploma and know speaking lenguages, then you can not do a thing with them!
And yes, I do have the same job, just the comany (and the country) that's changed.