Salaries in start-up land are skyrocketing for high performing employees. SoundCloud had an average salary of ~€90k or something close to it. Lots of dual income, no kid hipster professional couples with tons of disposable income.
The majority of tech jobs in Berlin does not pay even close to €90k per year. That is the problem with averages. You have a few people earning loads and the rest on much lower income. It would be much better to look at the Median income in Berlin.
People who could be working at FANG are pulling 80+k here amongst the well-funded startups or Siemens etc. Google Munich pays over €100k for their standard dev roles, AFAIK. Zurich is substantially higher, but it's genuinely more expensive.