Funnily enough I know the habits of the wireless networks we use really well, and it doesn't "happen all the time".
No. They are stealing packages from peoples doorsteps, people's handbags and backpacks from god knows where (because they discard them in our bins), major shoplifting from supermarkets, and god knows what else they get up to when they go out for hours everyday and reappear at about 1am usually shouting as they walk up the street. It's all just part of a pattern of constant crime. Dealing too, as you already know.
It's a fair assumption to make, especially when backed up by content on their social media feeds. They might be addicts, but they are also just scumbags as well.