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?

Lol, I make totem-forests and chain heal pentagrams in Orgrimmar. A lot of people who have started to recognize me always yell 'make a star' or something like that. Plenty of /cheers too.

2. How often do you get hate whispers?

Not since hitting 70, or not as much. Still get the occasional /spit and /rude. Mainly those are from Alliance that I've recently one-shotted.

3. How often do you get reported?

Never that I know of.