Ok, I'll drop my two cents also:
From the posts I understand your frustration with slicing.
I picked this skills just recently after it was nerfed, so I missed the times where you could make lots of money. Took me some time to figure out what this skill was all about, but in general I had small profit all the time even though some of the missions were a pure loss of money (failed or less then invested). So as I figured it out its just an extra small income you have on the side. (so far just reached lvl30 with it)
This said, I do feel your pain of not being able to score big cash fast, but it still does what it was supposed to do - make income without doing anything. So maybe it's not that bad?