but as I hope you would agree, life is not only about savings potential :)
That may be true, and I myself did take a massive cut in savings potential when I lived in Poland for twelve years. But, having already had more than enough in the bank to retire quite comfortably, and having no obligations to anyone besides myself, I could have afforded to.
If you still need to save up for retirement, or if you have or plan to have a family, especially children, thumbing your nose at $100 k a year would be very foolish indeed. A wise choice would be to keep working in the States and take extended vacations from time to time in Poland.
Believe me, the older you get, the more important potential savings will become for you, until you reach the point where there is little else you think about unless you have enough stashed away. Personally, I think you're setting yourself up for some major disappointment and a lifetime of regret, because I get the feeling that you are acting on some silly romantic idealization of life in Poland, and life in general. While I thoroughly enjoyed my twelve years in Poland, I can assure you that any romantic fantasies you may have are going to be dispelled very quickly. Poland has a way of doing that.