Well, if the pot is let's say 100 euros and the rake is 3 euros that's really nothing different from 3 dollars in a 100 dollar pot? Obviously it's more money, but at the same time the pot is worth more too if it's euros.
I mean the ones where you actually play in euro and not in dollars. I'd see how it'd be a problem if the pot was in dollars but the rake was 3 euros instead.