I don't think the wages are all that bad considering the generous benefits. What's really killing is the cost of living here.
So a self-employed dev making 100k would be comparable to an employee making 30-40k. It's a very rough estimate; it's probably a bit better than that.
I'm self-employed and have about €120k revenue per year (working 4 days a week), and I think my taxable income ended up below €60k last year.
Employees are insured for unemployment, disability etc. Your employer is insured to cover your wages if you're sick. If you're self employed, you either don't get paid for hours not spent working, or you have to buy similar insurances commercially. You will also need insurance for liability and probably for legal costs. If you're good at your job and good at selling yourself, you probably make more than an employee would, but the 60 an hour are not pure profit.
You're not going to make that kind of money by working projects for a consultancy firm though, the margins they are making on your skills are ridiculous.