If revellers and party-goers could get hold of drugs (which have been certified by the drugs advisory board as LESS DANGEROUS THAN ALCOHOL AND TOBACCO) such as cannabis and ecstacy legally, pay tax on them and have the quality / purity regulated by a government agency there would be NO NEED for anyone to be making untested, new, possibly far more dangerous "legal highs".
Although how, when the evidence of "deaths caused by the drug" was formally discredited (the bodies didn't have a trace of methadrone in them), a ban on methadrone can stand, is beyond me.
Still, if the real drugs many of us have been taking for decades were legally monitored and regulated there would be no need to be trying all these strange new chemicals.