The thing with PTR testing is that players (quite often) tend to keep the bugs to themselves, to use them later on live. Then we have hotfixes like that
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ftfy
No, seriously, they should stop doing that shit, selling raid runs? Buying characters? What the fuck really.
Funny thing is that guilds who do the same shit "because top guilds do paid runs too" do that without realizing that they'll get a much greater hit than "top guilds" - two friends of mine who were selling mythic gul'dan got perma'd and they don't have resources to just buy someone elses character (without getting detected and banned again) and keep doing this shit. Off course their RL who kept most of money to himself didn't care - he had a "healthy roster of rogues" to pull new victims from.
TL;DR: guilds should stop selling runs and buying characters and just count their losses when they get hit with banhammer, or accept that they won't be able to get 925+ balance druids or whatever next week, don't they have fucking dignity or ethics? After all they only show an example how guild shouldn't be operating.
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That's... that's the nature of MMORPG - before doing late game content you have to grind to proper power level...