Net salary is only one part of the equation. Find me any businessman who earns >€100.000pa and examine the package they have. I would expect to find: health insurance, company car, company contributed pension scheme 20-25% of gross salary, share options if applicable, bonuses if applicable, flexible holiday & days-off scheme, loss on income insurance (PHI), respectful senior management, decently furnished and clean offices and washrooms, unquestionable sickness reporting scheme, transparent employment package giving employment protections & rights, etc. etc.
The salary, compared to other vocations, might be acceptable, but the package, especially pension scheme, is often way below what the salary levels should command. That is a true comparison. The vocational element allows exploitation; and it has been allowed for decades.