Most of your questions are obvious. ?
First of all. ofc. it decreases your chance to get banned if you watch your bot.
2) GM's can and will try anything if they feel like it, sometimes they spawn mobs, othertimes they just teleport you etc. Can be many things.
3) No
4) Ofc. (This will take a long time though).
It's 50% about luck.
Even if you get teleported, if you are able to talk to the gm who does it, and behave "human-ish" you might just get ported back to orgrimmar/stormwind.
Also remember that, if you get reported, it's not like they read the report and ban or teleport you. They follow you around to see how bot-like you seem.