How much hostility should I expect to face?

[cvt]

1. Do you attempt to "hide" multi-boxing? Run from instance to instance and hope people don't see? Never go into a city as a group? etc?

2. How often do you get hate whispers?

3. How often do you get reported?

1. Never, why would I hide the fact I multiboxing. I mainly tri-box (tank healer and dps), and join LFG etc.. to find the extra dps at times if needed.

2. Hate usually comes in the form of general channel, not whispers, and its uncommon. And the higher in level you get, the less it happens... If your horde in barrens, expect a constant stream :P I find it amusing.
I get 10 times the hate whispers on my twink than I ever have multiboxing, even in BG's. Constantly have people making lvl 1's on my server to abuse my twink, never had that when multiboxing.

3. Can't answer that, as I have never had a GM contact me, but I have had whispers and comments in general that 'you have been reported for botting/hacking'. I'd say not more than once every couple days pre lvl 30, and not seen it since.

I have only started serious tri-boxing, and occasional 5 box, but for years (pre-bc) I have been dual boxing melee+ranged, and dual boxing seems to go greatly ignored in comparison.