Czechia, Slovakia, Poland, Croatia, Slovenia, Serbia, Romania, Hungary, Latvia, Estonia, Lithuania, Bulgaria and Montenegro. Probably Greece too but I don't know how it's there personally. Plus the non-EU countries in the region - Albania, Serbia, Kosovo, Moldova, North Macedonia and Bosnia and Herzegovina.

I sort of thought so. I'm in Prague myself and I would say that 5x-10x may be a bit of a stretch. I'm personally only a bit over 2x country average, though I think I'm underpaid so I might be checking out the market soon.

Most people in CZ have around 24k CZK/month, and 240k/month is certainly doable for a programmer. Not an average one, that's true - though not necessarily the best one, there's still plenty room to the top.

Shoot me an email at emteycz@gmail.com, I might be able to help you.