It's sin that is in
Doesn't it seem really important that we sin? Let me give you an example:
And if men come unto me I will show unto them their weakness. I give unto men weakness that they may be humble; and my grace is sufficient for all men that humble themselves before me; for if they humble themselves before me, and have faith in me, then will I make weak things become strong unto them.
Now normally we use this verse as a way to help people out of sin, but look at what it is saying: we are inherently weak, in part, because this is the only way to make us humble enough to turn to God. If we become humble enough, we will come to rely on His grace and become strong in Him. Here's the bookend verse to this one:
And we will prove them herewith, to see if they will do all things whatsoever the Lord their God shall command them;
Here we are given an impossible task (complete and total lifelong obedience) as our goal, necessary for exaltation. We are set up to fail, but it is just as well. Our failings will cause us to rely on the Savior, which is God's goal anyway. Doesn't the great authority (Nibley, of course) say that the righteous person is the one who is repenting?
Now I am not arguing against Paul's words in Romans 6:1-2. Of course we shouldn't sin just to get more repentance in our life. I just think it is interesting that the degree to which we sin is built into the system in such a way that it can (and should) turn us toward God. And, if we sin less, presumably this is because we have already done the turning.