it's difficult to give you an answer as every server has a different economy. i have 2 bots going just like yours and i easily make 3-5k a day. alliance btw as horde sucks big fat ones. but i prospect all ores (working on inscription to mill all the herbs). i have a 6 tab guildbank that pretty much stays full (as a backup, i sell tons of items a day but I have the gb for mats/long term storage. 1 of misc items (pots/scrolls/rep items/etc)/1 tab full of ores/1 of herbs/1 of food items (fish mostly)/1 of gems/1 of items (all blue/purple/champion/soldier/hieraphant items to equip on toons when leveling). Plus all my toons have all 7 bags in their personal bank all with frostweave/herb/mining bags. Each of them stores other stuff (i'm a packrat at heart). But I find it easier to do it that way. I have mats tucked away for leveling tailoring/leatherworking/etc, I've just not sat down and took the time to level them all up.
That said, on 1 account i have my lock (gearscore is almost 3000 now) and on the other I have a mage (almost 3k GS as well) & a shaman (~2800 GS). I also support my 2 friends habits as well. I've bought their toons epic flying/training/choppers/gear/mounts etc. They don't seem to mind that I bot for some reason. Despite my gruff attitude, I'm a pretty decent guy and regularly drop 1000's on friends.
One friend, i believe he was around level 65-70, who I was helping with a few quests, was wearing all crap green/quest gear. After a quick trip to the AH he was wearing all blues/purples. I don't sell any gold either btw. I have more fun botting that playing tbh.
