^ Yup, this is definitely part of the problem - same with pills too, why people will go back to a dealer that sells them shitty drugs is just baffling... but they must, otherwise most of the dealers of shitty drugs would struggle to stay in business... supply and demand and all that.
But, a crucial Question: How many people here would go back to their dealer and kick up a fuss about some shit drugs they were sold? How many would ask for a refund? How many would actually buy the better quality stuff on offer? honestly?
Whilst ever drugs are illegal and unregulated there will be adulterants... but the more people demand.. and back that up with action, the better quality the drugs will be. I for one would only buy the best quality coke on offer, if only to make a statement that cut crap is pointless.