The problem isn't just paying more. I'm aware of how tax-heavy europe is, and how much harder it is to support the wide variety of languages and laws. In most cases, I would be fine paying a bit more for a service.
The problem is the way the mark-up happens. They're not calculating the difference and marking that up, they're literally just equating US dollars with euros. $99 and €99 might sound similar, but the difference is over 30%. There is no way the additional support costs run that high, so it comes across as just an attempt to pull a fast one on europeans.
I'm sure if they did a proper calculation and gave a realistic number, nobody would complain about the increased cost.