I suspect there is a lot of bravado in this thread. I mean, what if you had been arrested and had a bullshit dog of a dealer in your phone?
I mean, say you have a dealer who has frequently ripped you and your friends off, selling drugs which they knew were shit and refusing to give refunds. Then you get arrested for some reason, and the cops offer you a lesser charge if you dob the guy in (with your lawyer present, since you would never be stupid enough to say a single word to the police without a lawyer). I suspect most people would dob them in. Being arrested and charged is scary shit, and ultimately do you owe this dodgy dealer anything?
It's very easy to be all tough and say that you're all in the drug game together and that you should never dob anyone in, but I think that's bullshit. You're not in anything together. They are a drug dealer and you are a customer, and that's it. Do you owe anything to Coles or BP? Particularly if they regularly sell you shit and rip you off?
I don't think it's okay to just ring up the cops and dob a dealer in because you don't like them. But if you're sitting in a room with a couple of cops (and your lawyer) and you can get a lesser charge by dobbing in a dodgy cunt who's selling shit and treating their customers like shit then I doubt many people would say no.