First of all: You could opt for the subscription model if you really are starting by "I don't own anything EU4 related" and want to go to "Gimme all".
And secondly: Compare to Euro. The "all in" game costs (without discounts) about 400€ (or 5€/month for subscription). Even in one of the richer Euro-countries (Germany) this would amount to about 1/3 of monthly median income (According to
https://worldpopulationreview.com/country-rankings/median-income-by-country).
Most other Euro countries have a (far) lower median (some even below that of Poland) but still the same price. Euro is Euro.
So, no. The price in Poland isn't (even after the increase) exceptionally high.
You could argue that the price over all is quite high. And I'd tend to agree. But you could wait for sales. Or just pick the subscription.