That's what the customer pays, not what you see on your paycheck. 100€/h would equate to 16.000€ gross a month/192k a year, and no one pays that in webdev.
As the other comment said not everything is "billable hours" and, speaking for Germany again as a Freelancer, you've got taxes, health insurance etc. so your 16k get down to much, much less pretty fast.
In my experience contracting for bigger companies you can be close to 100% billable by just billing a default 8 hours per day. Not counting the time without an assignment of course, but that should not be long if you have skills and a network.
