>>Poland is also a member of WTO having certain obligations such as allowing imports.<<
Allowing imports is what kills self-sufficiency and hence sovereignty. These “organisations” should be shunned like the plague they are.
>>Poland receives a lot more than it provides to EU budget<<
Then they are beggars and parasites and should exit the EU on moral principles. Being a beggar is not an honorable thing.
>>^ In addition, the GDP of Poland has increased 4 times ever since Poland became a member of EU.<<
So, are there four times as many people, or is their industry four times bigger now that their GDP has risen. Or are they just four times fatter?