It's all about envy and jealousy. People in poland know how easy life is in canada, for example, compared to poland. An educated or skilled(mechanic, electrician, etc..) canadian can live a very comfortable life in this country. In poland, this is not the case. Doctors(800zl/month), teachers, professors, engineers make next to nothing. This is not limited to poles though, most of the people on this planet would do anything to live like the average canadian.
But what happens when you go to visit the Old Country? Don't you talk about your family living in a large house, with maybe a swimming pool and a couple of cars, don't you show pictures, tell'em how much you make? And all that while visiting someone who's appartement is the size of your bedroom closet and he lives there with a wife, two kids and in-laws.
Maybe a little sensitivity would be in order? maybe if we didn't throw the money at their faces by bringing each and every one a "present"?
No wonder they feel envious!