Sampling is the Swatching of the spinning world. In order to spin yarn for a particular purpose, you need to figure out how to make the fiber conform to your needs. Thus, you sample. You spin some small amount of the fiber (hoping, of course, that you have plenty more to actually spin for your project) and see if what you create has the properties you want for the intended end-use.
This fiber, unfortunately, does not conform to my needs. I need light-fingering weight yarn. I spun sport, maybe DK. It's really pretty though and I'll enjoy using it eventually. The fiber is a BFL/silk blend that I picked up at Textiles a Mano. I spun it as a test for working with an indigo-dyed BFL/silk blend I have from a Fiber/Shawl club I'm in this year (The Pro-Verbial Club, from A Verb for Keeping Warm). We only have four ounces of a limited colorway to produce about 400 yards of yarn, and this sample isn't going to cut it.