I'm an honest dealer. If you buy one gram from me then you'll get exactly one gram. But what happens when you buy one gram from someone else? Let me explain how it's will going to go. 

You call your buddy, who knows someone else, who knows a guy who exactly knows where to find a good stuff. Of course, he's someone you can trust, and he'll never leave you stuck with a deal.

You give your money to your buddy. He go to a guy who knows someone else, who can sell the stuff. The guy drives to the far side of the city. You're waiting... one, two, three hours. You call your buddy. He says something like, "C'mon, dude, it'll be all right soon." You keep waiting. Several more hours pass. You call again, but he doesn't answer. You  wait some more, then call again. This time he answers, "What's up, dude? Howdy?". Oh, damn hell! You stay calm and ask "Man, how much longer?". He's curious "How much longer what?". You're silent. Then he says, "Oh damn, sorry, dude, I call him right now".

An hour later, your phone rings. "Dude, so it happened, needs more money". You pay and keep watching series. After three episodes, your buddy comes back. Trumpets play anthems, clowns are jungling pins, and a bear is riding a unicycle. You get a piece of shit that was tested by a guy who never leaves you stuck with a deal, and it's not quite what you wanted.

I'm an honest dealer. One gram is always one gram.