As I said, I doubt you can compare taking Wellbutrin orally (where almost the whole dose is converted into non-dopaminergic metabolites before it reaches your brain) to snorting/shooting it, where you are getting a precious few minutes of actual dopamine-reuptake-inhibiting bupropion proper in your brain.
Yeah, chances are it's still a garbage drug compared to pretty much any other NDRI out there, but for people who can't get their hands on anything else, even the tiniest rush is probably worthwhile (although yeah, the placebo effect probably also plays a part).