If you find a bug that seems like it is too good to be true, like being able to generate ridiculous amounts of marks or experience easily, then please don't abuse it, just let us know and we'll get it fixed as a priority.

If we find you abusing said bugs, even after you've reported it, the chances are high that you're going to face some serious punishment - up to, and including, the permanent loss of your character. HELP BUGS has a detailed section about this.