Botting "human" or not doesen't play such a big roll as you all think.
My account, for example, is about 9 months old and I started botting 2-3 months ago. I put ~150-200€ in my account. I never got a captcha, I never got banned.
I am using iBot and KBot.
When I tested iBot on my noob account (level 3, registered on the same day), after 5 minutes, I got a captcha in every 2nd box. This account got banned forever in the next day.
You see: BP controls you much more when you didn't spend money for DO or/and you are a new player.
When you spent money for DO, BP would be stupid if they ban you, because you would stop paying money.