My opinion:
DEFINITELY use mirror.
I've been using mirror for nearly 2 months now with no bans
I tried use stealth at the same time as my mirror because my laptop can't handle several mirror clients and ended up with a ban on the account botted on stealth the next day but my account which had been suicide botting for 2 weeks wasn't even banned.
Mirror and premium scripts All the way
Any thieving script will generate a decent income, checkout Czar's thiever that's what I've been using ever since he released it, no bans yet! On mirror ofc:)
The ban doesn't really make a difference unless the buyer is wishing to bot the account which seems quite unlikely with these stats. It was back in 2013 and has since expired, the meter is still there though.
Thank you for your bid!
What is mirror -http://osbot.org/forum/topic/66803-what-is-osbots-mirror-client/
If you're planning on botting many accounts at the same time then mirror is not the best option because it takes up quite a lot of CPU
Yes you can also open as many clients as you like