I would say salaries are good, comparing salaries and cost of living (comparing to London or Paris for example).

I also heard contrary statements to yours regarding venture capital (may not be at the level of the US though).

And, there are a bunch of technology companies (TomTom, booking.com, Hyves...).

Companies seem to have a hard time hiring locals though, and there are quite a lot of foreigners working in IT. So that seems to corroborate your point about Dutch going abroad (or maybe simply not interested in software)