The only one blizzard shut down if I recall correctly was peons4hire and the only reason it worked was because it wasn't a chinese company. Most of these botting/gold selling companies originate in china and they generally don't give a crap about anyones copyright laws outsiders their border so nothing ever happens to them... like in any game. Only way they managed to hit them (and hard) is selling their own gold and while these companies probably sell for cheaper people are generally okay with paying a little more when it's not sketchy and theres no risk of getting banned or hacked.