If you don't want to do something, you can always rationalize it. If really wanted to work in Berlin or elsewhere, you'd do it, and it wouldn't be a big deal.
This is simply getting at the notion of the premium - how much I value working abroad.
A more formal way of asking this question, assuming for simplicity a $100K/year salary:
"How attractive (measured in dollars) is the idea of working in Berlin?"
If it's worth $30,000/year, you'll do it as long as you can make 70% of your US salary or more. Otherwise, it's not worth it.
It's not a matter of "not wanting to do something" - it's a matter of the opportunity cost. In this case, the opportunity cost of working abroad for US citizens is high (see philiphogden's comments), so the only people who will do it are the people who can rationalize taking a financial hit.
So yes, the answer is "you want it, just not enough". But the following question is, "how much should someone have to want to work abroad in order to do it?"
Unless you mean "cheaper than Europe in general", I guess these sites could use your input:
http://www.numbeo.com/cost-of-living/compare_cities.jsp?coun...
http://www.expatistan.com/cost-of-living/comparison/seattle/...
I considered going for some dutch jobs one of the reasons woudl be I that I have the max no of qualifying years in the UK pension scheme.