Germany: Prostiution or drugs which is strictly forbidden?

[WrtngCocaineTutorial]

I have always been under the impression that prostitution is legal in Germany. There is a lot of brothels, and a lot of people who purchase sex. If you want to buy 1, 10 or 100 prostitutes does not matter the way I have interpreted the law.

And I have thought that personal drug use was not punished harshly.

But then I came across a wikipedia article, it is about a person purchasing sex with a lot of prostitutes, and doing drugs. He had 6.6 grams of cocaine - which is more than a "personal use amount", but anyhow - far from enough to make a professor "rich" if he was to sell it.

from wikipedia

In August 2003 Jörg Immendorff was caught in the luxury suite of a Düsseldorf hotel with seven prostitutes (and four more on their way) and some cocaine. More cocaine was found in his studio; all in all, the found substances contained 6.6 grams of pure cocaine, above the legal threshold for personal use. In interviews, he attempted to explain his actions with his terminal illness and as an expression of his "orientalism" that provided inspiration for his work. He also complained about prostitutes "who don't understand that a good whore does not divulge anything about her clients."[3] He cooperated with the prosecution, admitted to having taken cocaine since the early 1990s and supplied the name of his dealer. At the trial in July 2004, he admitted to having organized 27 similar orgies between February 2001 and August 2003. He was sentenced to 11 months on probation and was fined 150,000 Euros. The mild verdict was justified with Immendorff's illness and his extensive confession. He had been suspended from his position at the university but was reinstated after the verdict.

Is 150.000 Euro's "mild"???
Does anyone know if it's the drug use or the or orgies that he is given this huge fine for?