What a waste of perfecty good coke.. Though I do wish that I was a rich artist who could make art out of drugs and get away with it. Us regualr people will just have to get used to sniffing every last milligram and dealing with cops.
Coke is not so common in Finland (we're more of a speed nation), so it tends to be crap (you can hardly feel a thing when you take a 0,1g line!) and bloody expensive. 60 dollars a gra? Oh, I wish! You can expect to pay at least $135 and up to $270 here. Of course, all drugs are at least twice as expensive here than in, say, America (and we do have more money to spend), but still, it's ridiculous. Thank god for the internet, where you can get quality drugs for cheap. Pretty much everyone here does that - selling drugs "on the street" isn't even a thing.
Also, 15-20% purity isn't "shitty" (well, it is, but not in comparison to reality), it's actually pretty common and in some places better than the average. One study showed that almost third of the coke seized by police in the UK was less than 9% pure.
It's even worse with heroin. The quality on the street can be less than 1%, and up to 20% (or higher, not not usually). If someone usually stuffs his veins with some 5% pure crap, and suddenly gets 20%.. well, let's just say that's how overdoses happens. This is just one of the many reasons the War on Drugs has to stop.