Just becuase you may not understand how some of us make so much doesnt mean it doesnt happen. A few people exaggerate sure, but there are ways to make a fair amount more with herbs/ore than just selling them. However most willnot openly share it becuase they don't want others cutting into their profits. IMO 70-80% of botters are oblivious to potential income they can make with the bot.
One key thing i will say though is finding a good realm to bot on. It takes quite some time of researching to find the best realms but i was able to compile a list of about top realms to bot on and transfered some of gathering toons to them. Everyone is looking for the easy answer of either a) high pop b)medium c)low. Population status is only one part of the puzzle but the only one that most people pay attention to.
IE... My top botting realm right now (High Population)
Green tea leaf-> 50-60g a stack
Ghost iron ore-> 60-70g a stack
Fools cap -> 100-120g a stack
Put in the research/effort and it will reward you, simple as that.