Being based in a country of lower costs of living is not an excuse for lower T&C-s, imho.
LOT is selling a product, called a flight from A to B which is not cheaper than the same product sold by SAS or Finnair. Why should it's employees have lower wages? Just because the majority of them are based in Eastern Europe? This can't be a factor in an argument defending the pathetic pay they have on offer. In fact there shouldn't be an argument at all.