No clue. But at $20 a 4oz skein, commercially spun, hand dyed merino tencel sock yarn is just flying out the door at Minds Eye Yarns. I don't know what the yardage on those skeins are, but it's more than enough for a pair of socks (in fact I've got A Cunning Plan for my leftovers!)
I'm a knitter, I often spend $100 or more on a sweater's worth of yarn (between 1,600 and 2,500 yards for an adult sweater, about 1,000 for an adult vest, depending on the yarn grist)
As for knitting time, I mostly knit when I'm doing something else. If I sat down to knit a sock it would take about 10 hours (Alden's "spinner's hours" - 40 minutes each). In reality, knitting in spare moments, it takes me about a month to make a pair of socks. Sweaters take me ages. But there again, I'm not making them for sale.
My (in)famous pi shawl took me over a year to spin and knit and it was my major project for most of that time. I once jokingly priced it at $1,000 and the interested party came close to writing out a check!