Could you provide a source for this statement because I'm pretty sure it's actually closer to 45k/y for fairly experienced developers
No, ezperienced C++ devs with the math skills you need to do 3d dev make 60k or more, 45k is just above fresh graduate level. I don't have an online source, just from what I know from companies and people I know, and doing hiring myself in the past. I made more than 45k 10+ years ago when I was an employee.
I was on approx 60k eur in Amsterdam a few years ago with 3 years experience
I should have been more clear. My point isn't that the salary comparison was off but that €30k/y is peanuts for a large organization. I would expect to see some higher sponsor levels.