Because of the costs: it's right that is cheap for what you get:
Imagine: 1 gr pure Clonazolam-powder + 1 l PG = 1mg/ml
If you don't have a tolerance I would recommend an allergy test before, and then start very little, 0,2 or something. And take care - there is a big danger to black out, even on 0,5 ml, if u are not used to it. So this is what I wanted to say: it is cheap like hell because you don't need a lot of material and even if you take 1ml, you can do it 1000 times with that bottle :D :D :D
JJ