I know this thread is old, but I wanted to throw in my own experience. I made my first batches in October/November of 2009. I was very excited that year to make soap for my family for Christmas, and did so, with a very elaborate tissue paper wrapping with different stencil-type designs on the paper that I did by hand. My mother kept her soap in a pretty basket in the bathroom for over a year before I picked it up one day and sniffed it. It definitely smelled off, so I unwrapped it and found the most DOS-riddled soap I've ever seen. It had to have happened over a course of several months. I tossed it in the trash immediately.
In the two years I've been working at it, I only have a handful of soaps that are even close to "foolproof". I am so glad I was lurking through this forum even back then, or I would not have understood DOS, or shelf life, or the importance of testing and waiting out a new formula.
I still don't sell, even after lots of urging and encouragement from friends and family, including DH, who stresses sometimes about the expense. He is a glass artist, and can sell his work without fear of a lawsuit because of potential skin reactions. It took some time for him to understand my hesitation. I think now he appreciates that I protected us.
The mods here can be shockingly harsh, but I trust them on this. What they say has borne out, in my own experience.