very. Used to be amazing, but due to the large amount of bots, seed prices dropped . but you still make quite a lot from 1-99 with master farmers. (used to be like 750k-1.5m per hour at 99 with quad loot) I am at 97, but not getting anywhere near that rate
I love the skill but at the same time i have found that the money can be good but not all the thieving ways make decent money... I know that master farmers are good and that is also fast xp... other then that the pyramid plunder is decent xp but not really good money