Rumor has it, that the bans have a duration of eight days in most cases. This is quite a mild penalty and should be considered as a warning. Professional boosting is a long grown and lucrative business for those players: A full Nighthold Mythic clear costs around €1.500, depending on who you ask.
Blizzard made clear that they will take a much closer look on these activities in the future and that selling clear-runs for in-game gold is totally fine though.
Full Blizzard Statement
If you see people advertising these services, please help us keep the game clean by reporting them. If you’re unsure, here are some common warning signs:
- A “broker” is offering to match buyers with service-providers. Commonly, a broker will collect real-world currency from a buyer while offering gold to a guild or group that will actually provide the service.
- Someone offering a service is unwilling to discuss terms of payment via in-game tells, and insists on using a non-Blizzard application to communicate.
Source: Bluepost on the forums