A lot of this is very true. Though it doesn't factor highly talented looking at quality of living beyond disposable income. The one thing I would say is a shared motivation for many of these types moving to Berlin is they are looking for more diverse environments provided by a city not yet choking on its housing costs, or cities that relegate them always to the bubble of the financially fortunate. Disposable income models don't capture this factor. I personally think a company that chose to pay well in Berlin would find a ton of highly qualified talent. Meh, I could obviously be totally wrong.