I gear my farmers with heroic dungeon gear over a day or so. Can get ilvl 463 in a few hours of grinding with Lazyraider. I also do LFR, faction gear, & some raiding for gear.
Two main reasons for this:
1) My toons don't look like bot farmers when geared. I personally think this makes a difference when a bot report is reviewed. If my toon has gear, achieves, other activities Blizz will less likely ban it as a bot.
2) My toons kill shit uber fast. Makes a huge difference when grinding meat, leather, motes, etc.