fav way to make money?

Painting and flower arranging (I wouldn't have thought of the latter) are very lucrative when done with higher skill levels, and gardening is essential for many aspects of my game play, but I recently discovered retail and, if money was my only concern, retail would be my choice. I usually make 500 to 700k per 24 hour shift (with Never Weary and Steel Bladder). My biggest problem now are taxes. None of the careers can compete with the money/time ratio of the activities I mentioned above.