Imo people are exaggerating abit on the " blizzard can do whatever they want , its their game " . Blizzard is not a dictatorship , its a company with customers.
I started botting around February , i do not consider myself a " veteran " in botting , but i will tell you what i think from my experience.
I have got about 15-20 wow accounts banned for botting , and i have never got any suspension or ban on my main account , even if i would often raid with my main account on the same pc and on the same time i was running bots on other accounts. And i have even sent gold / items from botting accounts to my main account or the opposite, although i tried to never exceed 10k-15k gold per mail.
Im not trying to say that its impossible for your main account to get banned if its running from same ip / computer as your botting account. But it is , in my opinion , very very low chance for that to happen.