Might vary a bit locally (~within Europe), but the gap between those numbers is way too large. StackOverflow survey puts a factor 2 (or 1.8 or something) between EU and US, not a factor 6.

300k+ is, from what I gather, very high for US, whereas 50k is more or less entry level in western EU. But take my impression as a data point (or a cluster), not the ultimate source of truth.