This is just like any other thread asking how anyone on here gets money for drugs.
There are people on here who use crack somewhat routinely and there are many people who have dabbled with crack, myself included. However, I don't think that many people use crack frequently here. There seems to be a lot more opiate users and people using pharmaceuticals. I'm not sure if there isn't as many people because there aren't as many people using crack in comparison to heroin and other opiates or if the lifestyle around frequent crack use keeps people away from the computer.
I know it's easy to get paranoid. So maybe they don't trust the computer.