Those all seem to be senior positions, and only in certain cities. So I would agree that $100k+ is a common salary for an engineer, especially a senior one. But the original post was talking about the bare minimum as a professional, which should include various kinds of professionals, at different levels of seniority and various locations.

For example, I'd consider jobs like this to be "professional" --> http://www.indeed.com/salary?q1=electrical+engineer&l1=c... http://www.indeed.com/salary?q1=software+engineer&l1=sea...