Ive been using sor-accounts since the service got launched. I use SoR on a friends account (which was inactive for 6 months, not that much), made a new 80 toon and all the drill, it was banned after 1 week.
I buy 3-5 sor accounts pretty much each 2 weeks and they all end up getting banned.
Back when I was farming with normal accounts, they usually lasted at least 2 months (botting 10-12h/day)
this is what my personal experience tells me
Ofc u may be more lucky, but even a brain-dead would understand that Blizzards knows about the "market" that is behind Sor accounts, they know that most botters just buy those accounts instead of buying new keys ect because chinese sor accounts are way cheaper. I dont know how can u be so closedminded and dont see this.